[BUG] JetBrains ClaudeCode PlugIn java IndexOutOfBounds Exception

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

java.lang.IndexOutOfBoundsException: Wrong offset: 19727. Should be in range: [0, 19725]
at com.intellij.openapi.editor.impl.LineSet.findLineIndex(LineSet.java:171)
at com.intellij.openapi.editor.impl.DocumentImpl.getLineNumber(DocumentImpl.java:1095)
at com.anthropic.code.plugin.mcp.tools.DiagnosticTools$addTools$1$1$1.daemonFinished$lambda$0(DiagnosticTools.kt:124)
at com.anthropic.code.plugin.mcp.tools.DiagnosticTools$addTools$1$1$1.daemonFinished$lambda$1(DiagnosticTools.kt:118)
at com.intellij.codeInsight.daemon.impl.DaemonCodeAnalyzerEx.lambda$processHighlights$0(DaemonCodeAnalyzerEx.java:74)
at com.intellij.util.containers.ContainerUtil.process(ContainerUtil.java:907)
at com.intellij.openapi.editor.impl.MarkupModelImpl.processRangeHighlightersOverlappingWith(MarkupModelImpl.java:303)
at com.intellij.codeInsight.daemon.impl.DaemonCodeAnalyzerEx.processHighlights(DaemonCodeAnalyzerEx.java:67)
at com.intellij.codeInsight.daemon.impl.DaemonCodeAnalyzerEx.processHighlights(DaemonCodeAnalyzerEx.java:51)
at com.anthropic.code.plugin.mcp.tools.DiagnosticTools$addTools$1$1$1.daemonFinished(DiagnosticTools.kt:112)
at com.intellij.codeInsight.daemon.DaemonCodeAnalyzer$DaemonListener.daemonFinished(DaemonCodeAnalyzer.java:123)
at com.intellij.util.messages.impl.MessageBusImplKt.invokeMethod(MessageBusImpl.kt:831)
at com.intellij.util.messages.impl.MessageBusImplKt.invokeListener(MessageBusImpl.kt:775)
at com.intellij.util.messages.impl.MessageBusImplKt.executeOrAddToQueue(MessageBusImpl.kt:596)
at com.intellij.util.messages.impl.MessagePublisher.publish$intellij_platform_core(MessageBusImpl.kt:567)
at com.intellij.util.messages.impl.MessagePublisher.invoke(MessageBusImpl.kt:544)
at jdk.proxy2/jdk.proxy2.$Proxy110.daemonFinished(Unknown Source)
at com.intellij.codeInsight.daemon.impl.DaemonCodeAnalyzerImpl$MyDaemonProgressIndicator.onStop(DaemonCodeAnalyzerImpl.java:1493)
at com.intellij.codeInsight.daemon.impl.DaemonProgressIndicator.stop(DaemonProgressIndicator.java:39)
at com.intellij.codeInsight.daemon.impl.PassExecutorService.lambda$applyInformationToEditorsLater$3(PassExecutorService.java:568)
at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:236)
at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:22)
at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:198)
at com.intellij.openapi.application.impl.AppImplKt$runnableUnitFunction$1.invoke(appImpl.kt:124)
at com.intellij.openapi.application.impl.AppImplKt$runnableUnitFunction$1.invoke(appImpl.kt:124)
at com.intellij.platform.locking.impl.NestedLocksThreadingSupport.runWriteIntentReadAction(NestedLocksThreadingSupport.kt:705)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:1094)
at com.intellij.openapi.application.impl.ApplicationImpl$7.lambda$run$0(ApplicationImpl.java:648)
at com.intellij.concurrency.ThreadContext.installThreadContext(threadContext.kt:305)
at com.intellij.openapi.application.impl.ApplicationImpl$7.run(ApplicationImpl.java:646)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:192)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:192)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:198)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:192)
at com.intellij.util.concurrency.ContextRunnable.lambda$run$0(ContextRunnable.java:26)
at com.intellij.concurrency.ThreadContext.resetThreadContext(threadContext.kt:294)
at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:25)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.runNextEvent$lambda$1$1$0(NonBlockingFlushQueue.kt:334)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:928)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.runNextEvent$lambda$1$1(NonBlockingFlushQueue.kt:333)
at com.intellij.concurrency.ThreadContext.resetThreadContext(threadContext.kt:294)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.runNextEvent$lambda$1(NonBlockingFlushQueue.kt:330)
at com.intellij.platform.locking.impl.NestedLocksThreadingSupport.tryRunWriteIntentReadAction(NestedLocksThreadingSupport.kt:747)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.runNextEvent(NonBlockingFlushQueue.kt:326)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.flushNow(NonBlockingFlushQueue.kt:305)
at com.intellij.openapi.application.impl.NonBlockingFlushQueue.FLUSH_NOW$lambda$0(NonBlockingFlushQueue.kt:167)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:323)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:732)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:711)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:720)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:573)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$0$0$0(IdeEventQueue.kt:377)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$0(IdeEventQueue.kt:1110)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:106)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:1110)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$0(IdeEventQueue.kt:375)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:415)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)

What Should Happen?

I should stop getting a pop up in pycharm about it.

Error Messages/Logs

Steps to Reproduce

The pattern from the three occurrences: it triggers when the JetBrains daemon finishes analyzing a file that was edited during the analysis. Likely reproduction steps:

1. Open a Python file in JetBrains with the Claude Code plugin active
2. Make an edit that changes the file length (add or remove lines)
3. Let the daemon code analyzer run while the file is still being modified (or immediately after)
4. Plugin tries to map diagnostic offsets to line numbers, but the line index no longer matches the file length → IndexOutOfBoundsException

In our session specifically: it was probably triggered by the edits to catalog_state.py and schema_page.py, which are fairly large files. The offset 19727 vs range [0, 19725] is only 2 bytes off — classic race condition
between file write and daemon callback.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

0.1.14-beta

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_