java.lang.NullPointerException
        at com.sun.tools.javac.code.Symbol$MethodSymbol.params(Symbol.java:1201)
        at com.sun.tools.javac.code.Symbol$MethodSymbol.getParameters(Symbol.java:1233)
        at com.sun.tools.javac.code.Symbol$MethodSymbol.getParameters(Symbol.java:985)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionItem$MethodItem.<init>(JavaFXCompletionItem.java:718)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionItem$MethodItem.<init>(JavaFXCompletionItem.java:677)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionItem.createExecutableItem(JavaFXCompletionItem.java:126)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionEnvironment.addMembers(JavaFXCompletionEnvironment.java:312)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionEnvironment.addMembers(JavaFXCompletionEnvironment.java:217)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionEnvironment.addLocalMembersAndVars(JavaFXCompletionEnvironment.java:413)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionEnvironment.localResult(JavaFXCompletionEnvironment.java:351)
        at org.netbeans.modules.javafx.editor.completion.environment.BlockExpressionEnvironment.inside(BlockExpressionEnvironment.java:82)
        at org.netbeans.modules.javafx.editor.completion.environment.BlockExpressionEnvironment.inside(BlockExpressionEnvironment.java:57)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionQuery.resolveCompletion(JavaFXCompletionQuery.java:399)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionQuery.run(JavaFXCompletionQuery.java:346)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionQuery.run(JavaFXCompletionQuery.java:74)
        at org.netbeans.api.javafx.source.JavaFXSource.runUserActionTask(JavaFXSource.java:503)
        at org.netbeans.modules.javafx.source.scheduler.CompilationJob.runWhenScanFinished(CompilationJob.java:270)
        at org.netbeans.api.javafx.source.JavaFXSource.runWhenScanFinished(JavaFXSource.java:739)
        at org.netbeans.modules.javafx.editor.completion.JavaFXCompletionQuery.query(JavaFXCompletionQuery.java:243)
        at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:218)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:577)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1030)