Fix NPE when saving preferences

CHANGELOG.md

@@ -24,7 +24,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 ### Fixed
 
 - We fixed an issue where the 'Check for updates' preference was not saved. [#11485](https://github.com/JabRef/jabref/pull/11485)
-- We fixed an issue where an exception was thrown after changing "show preview as a tab" in the preferences. [#11509](https://github.com/JabRef/jabref/pull/11509)
+- We fixed an issue where an exception was thrown after changing "show preview as a tab" in the preferences. [#11515](https://github.com/JabRef/jabref/pull/11515)
 
 ### Removed
 

src/main/java/org/jabref/gui/entryeditor/EntryEditor.java

@@ -147,6 +147,12 @@ public EntryEditor(LibraryTab libraryTab, UndoAction undoAction, RedoAction redo
                 activeTab.notifyAboutFocus(currentlyEditedEntry);
             }
         });
+        EasyBind.listen(preferencesService.getPreviewPreferences().showPreviewAsExtraTabProperty(),
+                (obs, oldValue, newValue) -> {
+                    if (currentlyEditedEntry != null) {
+                        adaptVisibleTabs();
+                    }
+                });
     }
 
     private void setupDragAndDrop(LibraryTab libraryTab) {
@@ -384,9 +390,6 @@ public void setCurrentlyEditedEntry(BibEntry currentlyEditedEntry) {
             getSelectedTab().notifyAboutFocus(currentlyEditedEntry);
         });
 
-        EasyBind.listen(preferencesService.getPreviewPreferences().showPreviewAsExtraTabProperty(),
-                (obs, oldValue, newValue) -> adaptVisibleTabs());
-
         adaptVisibleTabs();
         setupToolBar();