java.lang.AssertionError
   at com.oracle.nashorn.parser.Lexer.scanRegEx(Lexer.java:533)
   at com.oracle.nashorn.parser.Lexer.lexify(Lexer.java:1425)
   at com.oracle.nashorn.parser.AbstractParser.getToken(AbstractParser.java:128)
   at com.oracle.nashorn.parser.AbstractParser.nextOrEOL(AbstractParser.java:168)
   at com.oracle.nashorn.parser.AbstractParser.next(AbstractParser.java:149)
   at com.oracle.nashorn.parser.JsonParser.parse(JsonParser.java:85)
   at org.netbeans.modules.javascript2.editor.parser.JsonParser.parseSource(JsonParser.java:78)
   at org.netbeans.modules.javascript2.editor.parser.SanitizingParser.parseContext(SanitizingParser.java:130)
   at org.netbeans.modules.javascript2.editor.parser.SanitizingParser.parseContext(SanitizingParser.java:110)
   at org.netbeans.modules.javascript2.editor.parser.SanitizingParser.parseSource(SanitizingParser.java:98)
   at org.netbeans.modules.javascript2.editor.parser.SanitizingParser.parse(SanitizingParser.java:76)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParse(TaskProcessor.java:595)
   at org.netbeans.modules.parsing.impl.SourceCache.getResult(SourceCache.java:225)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:717)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
   at java.util.concurrent.FutureTask.run(FutureTask.java:166)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)