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Exception when "pulling changes" from local database #6959

@m-mauersberger

Description

@m-mauersberger

JabRef 5.2--2020-09-29--2d92025
Linux 4.12.14-lp151.28.67-default amd64
Java 15

Steps to reproduce the behavior:

  1. Load a local database.
  2. Click on "Pull changes from shared database"
  3. Exception has been thrown.
Log File
java.lang.NullPointerException: Cannot invoke "org.jabref.logic.shared.DatabaseSynchronizer.pullChanges()" because "<local1>" is null
      at org.jabref.gui.shared.PullChangesFromSharedAction.lambda$execute$0(Unknown Source) ~[org.jabref:?]
      at java.util.Optional.ifPresent(Unknown Source) ~[?:?]
      at org.jabref.gui.shared.PullChangesFromSharedAction.execute(Unknown Source) ~[org.jabref:?]
      at org.jabref.gui.actions.JabRefAction.lambda$new$2(Unknown Source) ~[org.jabref:?]
      at org.controlsfx.control.action.Action.handle(Unknown Source) ~[org.jabref.merged.module:?]
      at org.controlsfx.control.action.Action.handle(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at javafx.event.Event.fireEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at javafx.scene.control.MenuItem.fire(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.scene.control.ContextMenuContent$MenuItemContainer.doSelect(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.scene.control.ContextMenuContent$MenuItemContainer.lambda$createChildren$12(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at javafx.event.Event.fireEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at javafx.scene.Scene$MouseHandler.process(Unknown Source) ~[org.jabref.merged.module:?]
      at javafx.scene.Scene.processMouseEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source) ~[org.jabref.merged.module:?]
      at java.security.AccessController.doPrivileged(Unknown Source) ~[?:?]
      at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.glass.ui.View.handleMouseEvent(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.glass.ui.View.notifyMouse(Unknown Source) ~[org.jabref.merged.module:?]
      at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) ~[org.jabref.merged.module:?]
      at com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source) ~[org.jabref.merged.module:?]
      at java.lang.Thread.run(Unknown Source) [?:?]

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