java.lang.UnsupportedOperationException
	at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:159)
	at java.base/java.util.ImmutableCollections$AbstractImmutableMap.put(ImmutableCollections.java:1318)
	at javafx.base@25.0.2/com.sun.javafx.collections.ObservableMapWrapper.put(ObservableMapWrapper.java:172)
	at javafx.base@25.0.2/com.sun.javafx.collections.ObservableMapWrapper.put(ObservableMapWrapper.java:172)
	at javafx.base@25.0.2/com.sun.javafx.collections.ObservableMapWrapper.putAll(ObservableMapWrapper.java:192)
	at org.jabref/org.jabref.gui.frame.SidePanePreferences.setPreferredPositions(SidePanePreferences.java:55)
	at org.jabref/org.jabref.gui.sidepane.SidePaneViewModel.updatePreferredPositions(SidePaneViewModel.java:118)
	at org.jabref/org.jabref.gui.sidepane.SidePaneViewModel.moveDown(SidePaneViewModel.java:142)
	at org.jabref/org.jabref.gui.sidepane.SidePaneViewModel$MoveDownAction.execute(SidePaneViewModel.java:209)
	at org.jabref/org.jabref.gui.sidepane.SidePaneComponent.lambda$createHeaderView$2(SidePaneComponent.java:57)
	at javafx.base@25.0.2/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
	at javafx.base@25.0.2/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:232)
	at javafx.base@25.0.2/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:189)
	at javafx.base@25.0.2/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at javafx.base@25.0.2/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
	at javafx.base@25.0.2/javafx.event.Event.fireEvent(Event.java:199)
	at javafx.graphics@25.0.2/javafx.scene.Node.fireEvent(Node.java:9067)
	at javafx.controls@25.0.2/javafx.scene.control.Button.fire(Button.java:203)
	at javafx.controls@25.0.2/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:207)
	at javafx.controls@25.0.2/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
	at javafx.base@25.0.2/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:247)
	at javafx.base@25.0.2/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
	at javafx.base@25.0.2/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:232)
	at javafx.base@25.0.2/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:189)
	at javafx.base@25.0.2/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at javafx.base@25.0.2/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at javafx.base@25.0.2/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at javafx.base@25.0.2/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
	at javafx.base@25.0.2/javafx.event.Event.fireEvent(Event.java:199)
	at javafx.graphics@25.0.2/javafx.scene.Scene$MouseHandler.process(Scene.java:4061)
	at javafx.graphics@25.0.2/javafx.scene.Scene.processMouseEvent(Scene.java:1947)
	at javafx.graphics@25.0.2/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2784)
	at javafx.graphics@25.0.2/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.get(GlassViewEventHandler.java:353)
	at javafx.graphics@25.0.2/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.get(GlassViewEventHandler.java:255)
	at javafx.graphics@25.0.2/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:424)
	at javafx.graphics@25.0.2/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
	at javafx.graphics@25.0.2/com.sun.glass.ui.View.handleMouseEvent(View.java:573)
	at javafx.graphics@25.0.2/com.sun.glass.ui.View.notifyMouse(View.java:975)
	at javafx.graphics@25.0.2/com.sun.glass.ui.mac.MacView.notifyMouse(MacView.java:131)