How to Fix an Enigmatica 9 Server That Keeps Crashing
Enigmatica 9 runs on NeoForge 1.20.1 with Java 17, and is leaner than kitchen-sink packs like ATM10 — but it carries a handful of known, specific crash causes worth checking before chasing a generic mod conflict.
See the Enigmatica 9 pack page for boot-tested RAM data before you chase anything else.
1. Emendatus crashing the server at startup
Emendatus, which handles ore and material generation, has been linked to startup crashes in some Enigmatica 9 releases. If the crash happens before the world even finishes loading, check the log for Emendatus specifically.
Updating to the latest patch for your pack version, where this has been addressed, is the usual fix — check the changelog for your target release.
2. EveryComp / Macaw's memory conflict
A known interaction between the EveryComp and Macaw's mods has made some Enigmatica 9 setups effectively unplayable below 16 GB of RAM, well above the pack's normal 10 GB floor.
If you're seeing heavy instability or OOM-style crashes at the recommended RAM despite a clean setup otherwise, this specific conflict is worth checking before assuming you just need more memory across the board.
3. Enigmatic Graves crashes
The grave system (Enigmatic Graves) has had crash bugs in earlier releases, generally fixed in later patches. If crashes correlate with player deaths specifically, this is the first thing to check, and updating to a current patch usually resolves it.
4. RAM below the 10 GB floor
10 GB is the pack's realistic starting point — E9 runs 1-2 GB lighter than ATM10 at equivalent player counts, but it's still a NeoForge expert pack, not a lightweight one. Below the floor, expect slow GC-pause lag building into tick timeouts rather than a single clean crash.
FAQ
What Java version does Enigmatica 9 need?+
Java 17. It runs on Minecraft 1.20.1 with NeoForge, which requires Java 17 on both the server and every connecting client.
Why is my server unplayable even with 10+ GB allocated?+
A known interaction between the EveryComp and Macaw's mods has made some E9 setups effectively unplayable below 16 GB — if you're on the pack's usual 10 GB floor and still seeing heavy instability, this conflict is worth ruling out before adding more RAM blindly.
What causes a crash right at server startup?+
Emendatus (an ore/material-generation mod) has been linked to startup crashes in some Enigmatica 9 versions. Check the crash log for Emendatus specifically before assuming it's a generic mod conflict.
Host Enigmatica 9 on hardware sized for its real floor
CoalHost runs Enigmatica 9 on NeoForge with Java 17 pre-configured and starts at the pack's measured 10 GB floor by default.
View Enigmatica 9 Hosting →