java.lang.NullPointerException
        at org.netbeans.lib.lexer.JoinTokenListBase.moveIndexGap(JoinTokenListBase.java:127)
        at org.netbeans.lib.lexer.inc.MutableJoinTokenList.moveIndexGap(MutableJoinTokenList.java:108)
        at org.netbeans.lib.lexer.inc.JoinTokenListChange.replaceTokens(JoinTokenListChange.java:242)
        at org.netbeans.lib.lexer.inc.MutableJoinTokenList.replaceTokens(MutableJoinTokenList.java:89)
        at org.netbeans.lib.lexer.inc.TokenListUpdater.updateJoined(TokenListUpdater.java:548)
        at org.netbeans.lib.lexer.inc.TokenHierarchyUpdate$UpdateItem.update(TokenHierarchyUpdate.java:394)
        at org.netbeans.lib.lexer.inc.TokenHierarchyUpdate.processLevelInfos(TokenHierarchyUpdate.java:213)
        at org.netbeans.lib.lexer.inc.TokenHierarchyUpdate.updateCreateOrRemoveEmbedding(TokenHierarchyUpdate.java:202)
        at org.netbeans.lib.lexer.EmbeddingContainer.createEmbedding(EmbeddingContainer.java:278)
        at org.netbeans.api.lexer.TokenSequence.createEmbedding(TokenSequence.java:416)
        at org.netbeans.modules.html.editor.coloring.EmbeddingUpdater.createEmbedding(EmbeddingUpdater.java:303)
        at org.netbeans.modules.html.editor.coloring.EmbeddingUpdater.createEmbedding(EmbeddingUpdater.java:241)
        at org.netbeans.modules.html.editor.coloring.EmbeddingUpdater.startTag(EmbeddingUpdater.java:149)
        at org.netbeans.modules.html.editor.coloring.EmbeddingUpdater.parsingFinished(EmbeddingUpdater.java:120)
        at org.netbeans.editor.ext.html.parser.SyntaxParser.notifyParsingFinished(SyntaxParser.java:238)
        at org.netbeans.editor.ext.html.parser.SyntaxParser.parse(SyntaxParser.java:222)
        at org.netbeans.editor.ext.html.parser.SyntaxParser.access$200(SyntaxParser.java:69)
        at org.netbeans.editor.ext.html.parser.SyntaxParser$4.run(SyntaxParser.java:151)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)