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java.lang.NullPointerException at org.testfx.util.NodeQueryUtils.fromWindow(NodeQueryUtils.java:179) at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) at org.testfx.util.NodeQueryUtils.rootOfWindow(NodeQueryUtils.java:75) at org.testfx.util.NodeQueryUtils.rootsOfWindows(NodeQueryUtils.java:65) at org.testfx.service.finder.impl.NodeFinderImpl.rootsOfWindows(NodeFinderImpl.java:116) at org.testfx.service.finder.impl.NodeFinderImpl.fromAll(NodeFinderImpl.java:77) at org.testfx.service.finder.impl.NodeFinderImpl.lookup(NodeFinderImpl.java:62) at org.testfx.api.FxRobot.lookup(FxRobot.java:212) at org.testfx.api.FxRobot.pointOfVisibleNode(FxRobot.java:1076) at org.testfx.api.FxRobot.clickOn(FxRobot.java:740) at org.testfx.api.FxRobot.rightClickOn(FxRobot.java:799)