javax.swing.text.BadLocationException: Invalid offset=-1 < 0; docLen=4147
   at org.netbeans.modules.editor.lib2.document.EditorDocumentContent.checkOffsetNonNegative(EditorDocumentContent.java:271)
   at org.netbeans.modules.editor.lib2.document.EditorDocumentContent.checkBoundsInContent(EditorDocumentContent.java:307)
   at org.netbeans.modules.editor.lib2.document.EditorDocumentContent.getChars(EditorDocumentContent.java:231)
   at javax.swing.text.AbstractDocument.getText(AbstractDocument.java:810)
   at org.netbeans.editor.DocumentUtilities.copyText(DocumentUtilities.java:97)
   at org.netbeans.editor.BaseDocument.getChars(BaseDocument.java:1204)
   at org.netbeans.editor.BaseDocument.getChars(BaseDocument.java:1183)
   at org.netbeans.editor.Utilities.getWord(Utilities.java:769)
   at org.netbeans.editor.Utilities.getIdentifierBlock(Utilities.java:661)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.getCompletionEnvironment(GsfCompletionProvider.java:723)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.resolveCompletion(GsfCompletionProvider.java:602)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.access$400(GsfCompletionProvider.java:250)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery$1.run(GsfCompletionProvider.java:336)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:153)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:137)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:104)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.query(GsfCompletionProvider.java:345)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)