java.lang.NullPointerException
   at org.netbeans.modules.html.editor.completion.HtmlCompletionProvider$DocQuery.doQuery(HtmlCompletionProvider.java:232)
   at org.netbeans.modules.html.editor.completion.HtmlCompletionProvider$AbstractQuery.query(HtmlCompletionProvider.java:281)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.lang.NullPointerException