How to Fix a Vault Hunters 2 Server That Keeps Crashing
Vault Hunters 2nd Edition runs on Forge 1.18.2, and most server crashes trace back to Java version, RAM, or one of a few pack-specific bugs — not a generic mod conflict.
See the Vault Hunters 2nd Edition pack page for boot-tested RAM data before you chase anything else.
1. Wrong Java version
Vault Hunters 2nd Edition needs Java 17 to run correctly on Forge 1.18.2. An older JVM throws class-loading errors on startup, and the error message doesn't always make the real cause obvious.
Fix: confirm the server is pinned to Java 17 specifically, not whatever default JVM happens to be installed.
2. RAM below the pack's 7 GB floor
4 GB can run a solo or duo server, but it's tight once Vault runs and talent progression ramp up — and the usual symptom is a slow slide into lag and tick-timeout crashes, not a clean error.
7 GB is the pack's own recommended floor for most servers; go to 8-10 GB once a small group is running overlapping Vaults.
3. Bounty completion crash bug
Some bounty completions have a known crash bug in this pack. If the crash happens reliably right as a player turns in a specific bounty type, that's the signature.
Fix: avoid completing that bounty type until the pack patches it. This is a known pack-side bug, not something a server config change resolves.
4. SkyVaults terrain generating outside the intended area
Running SkyVaults on a server can lead to overworld terrain generating outside its intended bounds, which shows up as world-generation errors or crashes in that specific area.
Fix: pre-generate the terrain with Forge's chunk-generation command ahead of time instead of letting it generate live as players explore.
5. Server freezing mid-Vault with no clear error
A server that goes unresponsive while players are actively inside a Vault, with no obvious crash log entry, is a known rough edge in this still-evolving pack rather than a misconfiguration to chase.
If it happens repeatedly on the same Vault type or biome, note the pattern — it's useful information if you report it, and it rules out a RAM or Java problem on your end.
FAQ
What Java version does Vault Hunters 2nd Edition need?+
Java 17 — it runs on Forge 1.18.2, and an older or mismatched JVM is one of the first things to check on a server that won't start cleanly.
Why does my server crash when a player completes a bounty?+
Some bounty completions have a known crash bug in Vault Hunters 2nd Edition. If it keeps happening on the same bounty type, avoid completing that specific bounty until the pack patches it, and treat it as a known pack bug rather than a server misconfiguration.
How much RAM does Vault Hunters 2 actually need?+
7 GB is the pack's own recommended floor for a small server. 4 GB can limp along solo but gets tight fast once Vault runs and talent progression ramp up — see the how much RAM does a Vault Hunters 2 server need guide for the full breakdown.
Host Vault Hunters 2 on hardware sized for its real floor
CoalHost starts Vault Hunters 2 servers at the pack's measured 7 GB floor by default, with backups in place before anything risky.
View Vault Hunters Hosting →