Activity

1. twothe

   added

   unverifiedIssue needs to be verified beyond initial report, or due to an old version.Issue needs to be verified beyond initial report, or due to an old version.

   triage

   21.1Relates to CM7 for MC 21.1Relates to CM7 for MC 21.1

   on Dec 9, 2025
2. twothe commented on Dec 9, 2025

   

   twothe

   on Dec 9, 2025

   Last edited by twothe

   Author

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   ChatGPT Analysis

   Root cause:
   CompactMachines.room(String) dereferences the static ROOM_REGISTRAR without a null check. On the client, during debug overlay rendering, ROOM_REGISTRAR has not been populated (it's set via reloadServices(MinecraftServer) on the server side). The call chain from RoomMetadataDebugOverlay.render(...) -> CompactMachines::room therefore NPEs.

   Minimal, safe fix (backwards-compatible):

   diff --git a/core-api/src/main/java/dev/compactmods/machines/api/CompactMachines.java b/core-api/src/main/java/dev/compactmods/machines/api/CompactMachines.java
   index XXXXX..YYYYY 100644
   --- a/core-api/src/main/java/dev/compactmods/machines/api/CompactMachines.java
   +++ b/core-api/src/main/java/dev/compactmods/machines/api/CompactMachines.java
   @@ -130,9 +130,14 @@ public final class CompactMachines {
        @ApiStatus.Internal
        private static IRoomRegistrar ROOM_REGISTRAR;
   
        public static Optional<RoomInstance> room(String roomCode) {
   -        return ROOM_REGISTRAR.get(roomCode);
   +        // Guard against client-side calls before server registrar is available.
   +        final IRoomRegistrar reg = ROOM_REGISTRAR;
   +        if (reg == null || roomCode == null) {
   +            return Optional.empty();
   +        }
   +        return reg.get(roomCode);
        }
    }

   Why this is sufficient:

   • RoomMetadataDebugOverlay.render(...) already uses Optional.flatMap(CompactMachines::room); returning Optional.empty() when the registrar is unavailable cleanly short-circuits overlay rendering without crashing.
   • No server behavior changes; once reloadServices(MinecraftServer) initializes ROOM_REGISTRAR, CompactMachines.room(...) works as before.
3. Gaz492 commented on Dec 12, 2025

   

   Gaz492

   on Dec 12, 2025

   Last edited by Gaz492

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   Just going to forward a report we had over on the FTB Issue tracker for this as well.
   You can find a crashlog at https://pste.me/@OUsPxuxTedU
   FTBTeam/FTB-Modpack-Issues#11015
4. Mimexe commented on Dec 12, 2025

   

   Mimexe

   on Dec 12, 2025

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   duplicate of #638 ?
5. robotgryphon commented on Dec 21, 2025

   

   robotgryphon

   on Dec 21, 2025

   Collaborator

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   This is caused by the same issue as #638 - registration methods being hit before services are loading. Merging into that ticket...
6. robotgryphon

   closed this as a duplicateof Game crash when opening F3 menu in a compact machine #638 on Dec 21, 2025