Minecraft Survival World Server Mod Crashing? How to Fix It

Experiencing crashes in your modded Minecraft survival world can be incredibly frustrating, especially when you’ve invested hours into building and exploring. Many players who delve into the world of Minecraft mods encounter these issues, and thankfully, most crashes are fixable. If you’re encountering the dreaded crash screen when trying to load your modded Minecraft survival world server, you’re in the right place. This guide will help you understand the common causes of these crashes and provide you with troubleshooting steps to get your server back up and running smoothly.

Let’s dive into a common Minecraft crash report and break down how to understand what might be going wrong.

Decoding Your Minecraft Crash Report: A Step-by-Step Guide

Crash reports, while initially intimidating, are your best friend when troubleshooting Minecraft issues. They contain valuable information that can pinpoint the source of the problem. Let’s analyze a sample crash report to understand what it tells us about a potential “Minecraft Survival World Server Mod” crash.

---- Minecraft Crash Report ----

// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 10/19/20 3:47 PM
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
    at net.minecraftforge.fml.config.ModConfig.getFullPath(ModConfig.java:98) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.config.ConfigFileTypeHandler$ConfigLoadingException.<init>(ConfigFileTypeHandler.java:128) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.config.ConfigFileTypeHandler.lambda$reader$1(ConfigFileTypeHandler.java:60) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.config.ConfigFileTypeHandler$Lambda$3874/49834970.apply(Unknown Source) ~[?:?] {}
    at net.minecraftforge.fml.config.ConfigTracker.openConfig(ConfigTracker.java:104) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.config.ConfigTracker.lambda$loadConfigs$1(ConfigTracker.java:83) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.config.ConfigTracker$Lambda$3873/1540355842.accept(Unknown Source) ~[?:?] {}
    at java.lang.Iterable.forEach(Iterable.java:75) ~[?:1.8.0_51] {}
    at java.util.Collections$SynchronizedCollection.forEach(Collections.java:2062) ~[?:1.8.0_51] {}
    at net.minecraftforge.fml.config.ConfigTracker.loadConfigs(ConfigTracker.java:83) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.server.ServerLifecycleHooks.handleServerAboutToStart(ServerLifecycleHooks.java:94) ~[?:?] {re:classloading}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
    at net.optifine.reflect.Reflector.callBoolean(Reflector.java:736) ~[?:?] {re:classloading}
    at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:85) ~[?:?] {re:classloading,xf:OptiFine:default}
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:616) [?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.lambda$func_240784_a_$0(MinecraftServer.java:229) [?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer$Lambda$5409/1704990977.run(Unknown Source) [?:?] {}
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51] {}


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.16.3
    Minecraft Version ID: 1.16.3
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 1002237920 bytes (955 MB) / 1912602624 bytes (1824 MB) up to 2147483648 bytes (2048 MB)
    CPUs: 8
    JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    ModLauncher: 7.0.1+78+master.e9771d8
    ModLauncher launch target: fmlclient
    ModLauncher naming: srg
    ModLauncher services:
        /mixin-0.8.1.jar mixin PLUGINSERVICE
        /eventbus-3.0.3-service.jar eventbus PLUGINSERVICE
        /forge-1.16.3-34.1.1.jar object_holder_definalize PLUGINSERVICE
        /forge-1.16.3-34.1.1.jar runtime_enum_extender PLUGINSERVICE
        /accesstransformers-2.2.0-shadowed.jar accesstransformer PLUGINSERVICE
        /forge-1.16.3-34.1.1.jar capability_inject_definalize PLUGINSERVICE
        /forge-1.16.3-34.1.1.jar runtimedistcleaner PLUGINSERVICE
        /mixin-0.8.1.jar mixin TRANSFORMATIONSERVICE
        /OptiFine_1.16.3_HD_U_G3.jar OptiFine TRANSFORMATIONSERVICE
        /forge-1.16.3-34.1.1.jar fml TRANSFORMATIONSERVICE
    FML: 34.1
    Forge: net.minecraftforge:34.1.1
    FML Language Providers:
        javafml@36acec54 minecraft@1
    Mod List:
        forge-1.16.3-34.1.1-client.jar                      Minecraft                    {<a data-cfemail="244d494e4543524146580457685757685f685e68" href="cdn-cgi/l/email-protection">[email protected]</a>} DONE
        Useful-Backpacks-Mod-1.16.3.jar                   Useful Backpacks             {<a data-cfemail="780d0b1d1e0d140c1f171f0c111f14033829362929362f36203a" href="cdn-cgi/l/email-protection">[email protected]</a>} DONE
        forge-1.16.3-34.1.1-universal.jar                   Forge                        {<a data-cfemail="76161f0217150f080d36051a05051a0d1a0c1a" href="cdn-cgi/l/email-protection">[email protected]</a>} DONE
        Useful-Railroads-Mod-1.16.3.jar                    Useful Railroads             {<a data-cfemail="394c4a5c5f4c55495a525a49545a51467908170d170c170f0e" href="cdn-cgi/l/email-protection">[email protected]</a>} DONE
        U-Team-Core-1.16.3.jar                             U Team Core                  {<a data-cfemail="a5d0d1e0e4e8e6eaf7e0e5f6c5b6abb4abbcabb4bdb4" href="cdn-cgi/l/email-protection">[email protected]</a>} DONE
        cfm-7.0.0-pre19-mc1.16.3 (1).jar                     MrCrayfish's Furniture Mod   {<a data-cfemail="b0d3d6ddd0a7dfd6d6a7c3d6c2c6a7c3d6c2c6f0f2c5d1d9" href="cdn-cgi/l/email-protection">[email protected]</a>} DONE
        jei-1.16.3-7.6.0.45.jar                            Just Enough Items            {<a data-cfemail="a7cdddcb87f0edcbece0edcbece0edcbece0" href="cdn-cgi/l/email-protection">[email protected]</a>} DONE
    Player Count: 0 / 8; []
    Data Packs: vanilla, mod:forge, mod:usefulrailroads, mod:uteamcore, mod:jei, mod:usefulbackpacks, mod:cfm (incompatible)
    Type: Integrated Server (map_client.txt)
    Is Modded: Definitely; Client brand changed to 'forge'
    OptiFine Version: OptiFine_1.16.3_HD_U_G3
    OptiFine Build: 20200916-082411
    Render Distance Chunks: 16
    Mipmaps: 4
    Anisotropic Filtering: 1
    Antialiasing: 0
    Multitexture: false
    Shaders: ComplementaryShaders_3.05
    OpenGlVersion: 4.6.0 NVIDIA 432.00
    OpenGlRenderer: GeForce GTX 1080/PCIe/SSE2
    OpenGlVendor: NVIDIA Corporation
    CpuCount: 8

Key Sections to Focus On:

Description: Exception in server tick loop. This is a general error, indicating a problem during the game’s regular update cycle.
java.lang.NullPointerException: This is the specific type of error. It means the game is trying to use a variable that is currently “null” (empty or doesn’t point to any data) when it shouldn’t be.
Stack Trace (the lines starting with at ...): This section lists the sequence of actions the game was performing when the crash occurred. It goes from the most recent action (at net.minecraftforge.fml.config.ModConfig.getFullPath...) backwards. Pay attention to mod names mentioned here. In this case, net.minecraftforge.fml.config suggests the issue is related to mod configurations, specifically with Forge Mod Loader.
System Details: This section provides information about your Minecraft setup:
- Minecraft Version & Forge Version: Minecraft Version: 1.16.3, Forge: net.minecraftforge:34.1.1. Crucial for checking mod compatibility.
- Operating System & Java Version: Useful for more technical issues but less likely to be the primary cause of mod-related crashes.
- Mod List: A list of all loaded mods. Mod List: section clearly shows all the mods you have installed, like “Useful Backpacks,” “Useful Railroads,” “MrCrayfish’s Furniture Mod,” and “Just Enough Items (JEI)”.
- OptiFine Version & Shaders: OptiFine Version: OptiFine_1.16.3_HD_U_G3, Shaders: ComplementaryShaders_3.05. These are graphics enhancements that can sometimes cause conflicts.
- Data Packs: Lists any data packs you have loaded. In this case, “cfm (incompatible)” is flagged, which might be a clue.

In this specific crash report, the NullPointerException related to net.minecraftforge.fml.config.ModConfig and the mention of “cfm (incompatible)” data pack are strong indicators that the crash is likely due to a configuration problem or incompatibility issue with MrCrayfish’s Furniture Mod (cfm) or its interaction with other mods or configurations.

Common Causes and Troubleshooting Steps for Modded Minecraft Server Crashes

Based on the crash report and common Minecraft modding issues, here’s a breakdown of potential causes and how to address them for your “minecraft survival world server mod”:

Mod Incompatibility or Conflicts:
- The Problem: Mods are developed independently and sometimes clash with each other, especially when they modify the same game mechanics or resources.
- Troubleshooting:
  - Check Mod Compatibility: Ensure all your mods are designed for the same Minecraft version (e.g., 1.16.3 in this case). Mod descriptions or download pages usually specify compatible versions.
  - Review the Crash Report’s Mod List: Look for any mods that might be outdated or known to conflict with others in your list. Sometimes, mod authors or communities will list known incompatibilities.
  - Disable Mods One by One: The most effective way to identify a conflicting mod is to disable them incrementally. Start by disabling recently added mods or mods that you suspect might be problematic (based on the crash report or mod descriptions). Restart your Minecraft server after each disabling step to see if the crash is resolved.
  - Focus on “cfm (incompatible)”: The data pack warning in the crash report directly points to MrCrayfish’s Furniture Mod as a potential source of the problem. Try disabling this mod first to see if it resolves the issue.
Outdated Mods or Minecraft Version:
- The Problem: Using outdated mods with a newer Minecraft version (or vice versa) can lead to crashes because the mods might not be compatible with the game’s changes.
- Troubleshooting:
  - Update Mods: Check for updates for all your installed mods. Mod authors often release updates to fix bugs and ensure compatibility with newer Minecraft versions. Use a mod manager like CurseForge or the mod’s official website to check for updates.
  - Update Forge: Ensure you are using a compatible version of Forge Mod Loader for your Minecraft version. Download the recommended or latest stable version of Forge from the official Forge website.
  - Downgrade Minecraft (Less Recommended): If updating mods isn’t feasible, you could consider downgrading your Minecraft version to match the mod versions. However, this is generally less desirable as you might miss out on newer game features and optimizations.
Configuration File Issues:
- The Problem: Mod configuration files can sometimes become corrupted or contain incorrect settings, leading to crashes when the game tries to load them. The NullPointerException in the example crash report, specifically mentioning ModConfig, hints at a configuration file issue.
- Troubleshooting:
  - Delete Configuration Files: Locate the configuration folder for your Minecraft instance (usually named “config” within your Minecraft directory). Backup this folder first! Then, try deleting the configuration files for the mods you suspect are causing issues, especially MrCrayfish’s Furniture Mod based on the crash report. When you restart Minecraft, the mods will usually regenerate default configuration files.
  - Check Configuration Files Manually (Advanced): If deleting config files isn’t ideal, you can try opening them (usually .cfg files) with a text editor. Look for any obviously incorrect or corrupted entries. Mod documentation might provide information on default or correct configuration settings. Be cautious when editing config files manually, as incorrect changes can worsen issues.
Insufficient Memory Allocation:
- The Problem: Modded Minecraft often requires more RAM (Random Access Memory) than vanilla Minecraft. If you haven’t allocated enough memory to Java, your game might crash, especially with larger modpacks.
- Troubleshooting:
  - Increase Allocated RAM: In your Minecraft launcher (e.g., the official Minecraft Launcher, CurseForge Launcher, etc.), find the settings to adjust Java arguments or JVM arguments. Increase the maximum RAM allocation (-Xmx flag in JVM arguments). For modded Minecraft, allocating 4GB to 6GB of RAM is often recommended, but adjust based on your modpack’s size and your system’s available RAM. In the example crash report, -Xmx2G is set, which might be insufficient for a modded world. Try increasing this to -Xmx4G or -Xmx6G.
Graphics Issues (OptiFine & Shaders):
- The Problem: While OptiFine and shaders enhance graphics, they can sometimes introduce instability or conflicts, especially with certain hardware or mod combinations.
- Troubleshooting:
  - Disable OptiFine and Shaders: Temporarily disable OptiFine and any shaders you are using to see if the crashes stop. If the game runs smoothly without them, then OptiFine or the shader configuration might be the issue.
  - Update Graphics Drivers: Ensure your graphics card drivers are up to date. Outdated drivers can cause compatibility problems with OptiFine and shaders.
  - Adjust OptiFine/Shader Settings: If you suspect OptiFine or shaders, try experimenting with their settings. Lowering graphics settings, disabling certain OptiFine features, or trying different shader packs might resolve conflicts.

Step-by-Step Troubleshooting Process

To effectively troubleshoot your “minecraft survival world server mod” crash, follow these steps systematically:

Examine the Crash Report: Carefully read the crash report, paying attention to the “Description,” “java.lang.NullPointerException” (or other exception type), the stack trace (mod names), and the “System Details” (Minecraft version, Forge version, Mod List, OptiFine/Shaders).
Address “cfm (incompatible)” First: Since the crash report flags MrCrayfish’s Furniture Mod as potentially incompatible, start by temporarily disabling this mod and see if the crash is resolved.
Disable Recently Added Mods: If disabling “cfm” doesn’t work, disable any other mods you’ve recently added or updated.
Disable Mods Incrementally: If the crash persists, systematically disable mods in groups. Start with mods that seem most likely to cause conflicts based on their function or any clues in the crash report. Restart Minecraft and test after each group is disabled.
Check Mod and Forge Versions: Verify that all your mods and Forge are compatible with your Minecraft version. Update them to the latest compatible versions.
Delete Configuration Files (with Backup): Backup your “config” folder and then try deleting configuration files for suspected mods.
Increase RAM Allocation: Increase the amount of RAM allocated to Java in your Minecraft launcher settings.
Disable OptiFine and Shaders: Temporarily disable OptiFine and shaders to rule out graphics-related issues.
Seek Mod-Specific Support: If you identify a specific mod as the likely cause, check the mod’s official website, CurseForge page, or community forums for known issues, compatibility notes, or troubleshooting guides.

Still Crashing? Seeking Further Assistance

If you’ve tried these troubleshooting steps and your “minecraft survival world server mod” is still crashing, here are some additional resources and tips for seeking help:

Pastebin or Gist: When asking for help online, share your full crash report using a service like Pastebin or Gist. This makes it easier for others to read and analyze the report without cluttering chat or forum posts.
Minecraft Modding Communities: Engage with Minecraft modding communities on forums like the official Minecraft Forums, Reddit (r/Minecraft, r/feedthebeast), or Discord servers dedicated to specific mods or modding in general. Provide your crash report and a clear description of your issue and troubleshooting steps you’ve already tried.
Mod Authors: If you suspect a specific mod is causing the crash, try contacting the mod author directly (if possible) or leaving a comment on their mod page. They might be aware of the issue or be able to provide specific guidance.
Be Detailed and Patient: When asking for help, provide as much detail as possible about your setup (Minecraft version, Forge version, mod list, etc.) and the troubleshooting steps you’ve already taken. Be patient, as finding the root cause of modded Minecraft crashes can sometimes take time and investigation.

By systematically analyzing your crash reports and following these troubleshooting steps, you should be able to identify and resolve most crashes in your modded Minecraft survival world server. Happy Minecrafting!