Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "java.lang.Integer.intValue()" because the return value of "java.util.Map.get(Object)" is null at jetuml/org.jetuml.rendering.SequenceDiagramRenderer.getY(SequenceDiagramRenderer.java:211) at jetuml/org.jetuml.rendering.nodes.CallNodeRenderer.internalGetBounds(CallNodeRenderer.java:114) at jetuml/org.jetuml.rendering.nodes.NodeStorage.getBounds(NodeStorage.java:48) at jetuml/org.jetuml.rendering.nodes.AbstractNodeRenderer.getBounds(AbstractNodeRenderer.java:111) at jetuml/org.jetuml.rendering.AbstractDiagramRenderer.getBounds(AbstractDiagramRenderer.java:203) at jetuml/org.jetuml.rendering.nodes.ImplicitParameterNodeRenderer.getMaxXYofChildren(ImplicitParameterNodeRenderer.java:117) at jetuml/org.jetuml.rendering.nodes.ImplicitParameterNodeRenderer.internalGetBounds(ImplicitParameterNodeRenderer.java:152) at jetuml/org.jetuml.rendering.nodes.NodeStorage.getBounds(NodeStorage.java:48) at jetuml/org.jetuml.rendering.nodes.AbstractNodeRenderer.getBounds(AbstractNodeRenderer.java:111) at jetuml/org.jetuml.rendering.AbstractDiagramRenderer.getBounds(AbstractDiagramRenderer.java:203) at jetuml/org.jetuml.rendering.AbstractDiagramRenderer.getBounds(AbstractDiagramRenderer.java:162) at jetuml/org.jetuml.rendering.SequenceDiagramRenderer.getBounds(SequenceDiagramRenderer.java:126) at jetuml/org.jetuml.gui.DiagramCanvas.getDiagramCanvasWidth(DiagramCanvas.java:365) at jetuml/org.jetuml.gui.DiagramCanvas.(DiagramCanvas.java:103) at jetuml/org.jetuml.gui.DiagramTab.(DiagramTab.java:69) at jetuml/org.jetuml.gui.EditorFrame.open(EditorFrame.java:298) at jetuml/org.jetuml.gui.EditorFrame.lambda$35(EditorFrame.java:325) at jetuml/org.jetuml.gui.NamedHandler.handle(NamedHandler.java:50) at jetuml/org.jetuml.gui.NamedHandler.handle(NamedHandler.java:1) at javafx.base@19/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86) at javafx.base@19/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234) at javafx.base@19/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) at javafx.base@19/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) at javafx.base@19/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49) at javafx.base@19/javafx.event.Event.fireEvent(Event.java:198) at javafx.graphics@19/javafx.scene.Node.fireEvent(Node.java:8923) at javafx.controls@19/javafx.scene.control.Button.fire(Button.java:203) at javafx.controls@19/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:207) at javafx.controls@19/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274) at javafx.base@19/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:247) at javafx.base@19/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) at javafx.base@19/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234) at javafx.base@19/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) at javafx.base@19/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at javafx.base@19/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) at javafx.base@19/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) at javafx.base@19/javafx.event.Event.fireEvent(Event.java:198) at javafx.graphics@19/javafx.scene.Scene$MouseHandler.process(Scene.java:3894) at javafx.graphics@19/javafx.scene.Scene.processMouseEvent(Scene.java:1887) at javafx.graphics@19/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2620) at javafx.graphics@19/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:411) at javafx.graphics@19/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:301) at java.base/java.security.AccessController.doPrivileged(AccessController.java:399) at javafx.graphics@19/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:450) at javafx.graphics@19/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:424) at javafx.graphics@19/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:449) at javafx.graphics@19/com.sun.glass.ui.View.handleMouseEvent(View.java:551) at javafx.graphics@19/com.sun.glass.ui.View.notifyMouse(View.java:937) at javafx.graphics@19/com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at javafx.graphics@19/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184) at java.base/java.lang.Thread.run(Thread.java:1589)