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Unable to execute commands in console before worlds are loaded #13580

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Unable to execute commands in console before worlds are loaded#13580
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status: acceptedDisputed bug is accepted as valid or Feature accepted as desired to be added.upstream: vanillaIssue exists in vanilla Minecraft.version: 1.21.11Game version 1.21.11version: 26.3Game version 26.3

Description

@molor
molor
opened on Jan 24, 2026

Expected behavior

All commands executed w/o issues after the server is done loading.

Observed/Actual behavior

Command exception: /version
java.lang.NullPointerException: Cannot invoke "net.minecraft.server.level.ServerLevel.getGameRules()" because the return value of "net.minecraft.commands.CommandSourceStack.getLevel()" is null
        at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:462) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.commands.Commands.performCommand(Commands.java:374) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.commands.Commands.performCommand(Commands.java:362) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.commands.Commands.performPrefixedCommand(Commands.java:353) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.server.dedicated.DedicatedServer.handleConsoleInputs(DedicatedServer.java:594) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.server.dedicated.DedicatedServer.tickConnection(DedicatedServer.java:550) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1838) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1616) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.server.dedicated.DedicatedServer.tickServer(DedicatedServer.java:427) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.server.MinecraftServer.processPacketsAndTick(MinecraftServer.java:1672) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1340) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:388) ~[paper-1.21.11.jar:1.21.11-90-4b35f5c]
        at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?]
An unexpected error occurred trying to execute that command

Steps/models to reproduce

1. Install Windows Server 2025
2. Install Java 25
3. Download Paper from https://papermc.io/downloads/paper
4. Create a start script using https://docs.papermc.io/misc/tools/start-script-gen/
5. Run the server using generated script
6. Accept Mojang EULA
7. Download some plugins (at least 10) so that it takes some time to start the server
8. Run the server using the script again
9. During loading of the server, execute any command (i.e. version)
10. Wait for the server to finish loading & enabling plugins
11. Meet the exception

Plugin and Datapack List

As I understand it, list of plugins doesn't matter.

There are 3 data pack(s) enabled: [vanilla (built-in)], [paper (built-in)], [file/Bukkit (world)]]
There are no more data packs available

Paper version

This server is running Paper version 1.21.11-90-main@4b35f5c (2026-01-09T18:48:48Z) (Implementing API version 1.21.11-R0.1-SNAPSHOT)
You are 9 version(s) behind

Other

No response

Activity

  1. molor
    added
    status: needs triage
    on Jan 24, 2026
  2. molor
    added the
    Bug
    issue type on Jan 24, 2026
  3. papermc-sniffer
    added
    version: 1.21.11Game version 1.21.11
    on Jan 24, 2026
  4. Doc94
    closed this as a duplicateof NPE when accessing CommandSourceStack#getLocation() #13387 on Jan 24, 2026
  5. Doc94
    added
    resolution: duplicateIssue or Request is a copy of an existing ticket.
    and removed
    status: needs triage
    on Jan 24, 2026
  6. Lulu13022002
    removed
    resolution: duplicateIssue or Request is a copy of an existing ticket.
    on Jan 24, 2026
  7. Lulu13022002
    reopened this on Jan 24, 2026
  8. Lulu13022002
    added
    upstream: vanillaIssue exists in vanilla Minecraft.
    status: needs triage
    on Jan 24, 2026
  9. Doc94
    added
    status: acceptedDisputed bug is accepted as valid or Feature accepted as desired to be added.
    and removed
    status: needs triage
    on Jan 26, 2026

  10. Doc94 commented on Jan 26, 2026

    @Doc94
    Doc94
    on Jan 26, 2026
    SponsorMember

    Confirmed in https://mojira.dev/MC-305939 its a Vanilla Bug.

  11. Lulu13022002
    changed the title [-]An unexpected error occurred[/-] [+]Unable to execute commands in console before worlds are loaded[/+] on Jan 26, 2026

  12. Magicrafter13 commented on Jul 13, 2026

    @Magicrafter13
    Magicrafter13
    on Jul 13, 2026

    Could we create a temporary workaround by not opening the stdin reader until the world is loaded, perhaps?

  13. wangzhizhou commented on Oct 2, 2026

    @wangzhizhou
    wangzhizhou
    on Oct 2, 2026

    Confirming this is still present on Paper 26.2 (reported on 26.2-126; reproduced on 26.2-129) and — importantly — it reproduces with zero plugins, so it is definitely unrelated to any plugin:

    Minimal repro (no plugins, only built-in datapacks):

    1. Start the server.
    2. Before Done (…) appears, type a vanilla command in the console, e.g. list.
    3. Let startup finish → Command exception: /list + the same NPE.
    java.lang.NullPointerException: Cannot invoke "net.minecraft.server.level.ServerLevel.getGameRules()" because the return value of "net.minecraft.commands.CommandSourceStack.getLevel()" is null
	at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:463) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.commands.Commands.performCommand(Commands.java:378) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.commands.Commands.performCommand(Commands.java:366) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.commands.Commands.performPrefixedCommand(Commands.java:357) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.server.dedicated.DedicatedServer.handleConsoleInputs(DedicatedServer.java:574) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.server.dedicated.DedicatedServer.tickConnection(DedicatedServer.java:530) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1837) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1620) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.server.dedicated.DedicatedServer.tickServer(DedicatedServer.java:404) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.server.MinecraftServer.processPacketsAndTick(MinecraftServer.java:1678) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1348) ~[paper-26.2.jar:26.2-129-9240f58]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:303) ~[?:?]
	at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?]

    The exact same command issued after Done (…) succeeds, and running the server without any plugins changes nothing — so plugin list is indeed irrelevant.

    Consistent with the upstream: vanilla label: a console line entered before the overworld is loaded is queued as a ConsoleInput carrying the CommandSourceStack built at that moment by MinecraftServer#createCommandSourceStack(), whose level is findRespawnDimension() → overworld() (null while worlds are loading). When the queue is drained, Commands#executeCommandInContext builds the ExecutionContext with an unconditional getLevel().getGameRules(...) (verified by disassembly of net.minecraft.commands.Commands).

  14. Doc94
    added
    version: 26.1Game version 26.1
    version: 26.2Game version 26.2
    version: 26.3Game version 26.3
    on Oct 2, 2026
  15. Warriorrrr
    removed
    version: 26.1Game version 26.1
    version: 26.2Game version 26.2
    on Oct 19, 2026
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    status: acceptedDisputed bug is accepted as valid or Feature accepted as desired to be added.upstream: vanillaIssue exists in vanilla Minecraft.version: 1.21.11Game version 1.21.11version: 26.3Game version 26.3

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