java.lang.NullPointerException
   at org.netbeans.editor.ext.html.parser.api.AstNode.getNameWithoutPrefix(AstNode.java:372)
   at org.netbeans.modules.html.editor.completion.HtmlCompletionQuery.query(HtmlCompletionQuery.java:418)
   at org.netbeans.modules.html.editor.completion.HtmlCompletionQuery$1.run(HtmlCompletionQuery.java:133)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1419)
   at org.netbeans.modules.html.editor.completion.HtmlCompletionQuery.run(HtmlCompletionQuery.java:125)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:154)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:138)
   at org.netbeans.modules.parsing.impl.TaskProcessor$1.call(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.impl.TaskProcessor$1.call(TaskProcessor.java:198)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:167)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:356)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:66)
Caused: org.netbeans.modules.parsing.spi.ParseException
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:206)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.modules.html.editor.completion.HtmlCompletionQuery.query(HtmlCompletionQuery.java:112)
   at org.netbeans.modules.html.editor.completion.HtmlCompletionProvider$Query.doQuery(HtmlCompletionProvider.java:119)
   at org.netbeans.modules.html.editor.completion.HtmlCompletionProvider$AbstractQuery.query(HtmlCompletionProvider.java:235)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)