fix: get_page_content retrieved non page-content objects from the too…

…lbar

djangocms_versioning/cms_toolbars.py

@@ -295,16 +295,18 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
     def get_page_content(self, language: Optional[str] = None) -> PageContent:
+        # This method overwrites the method in django CMS core. Not necessary 
+        # for django CMS 4.2+
         if not language:
             language = self.current_lang
 
         if self.page_content and self.page_content.language == language:
             # Already known - no need to query it again
             return self.page_content
         toolbar_obj = self.toolbar.get_object()
-        if toolbar_obj and toolbar_obj.language == language:
+        if isinstance(toolbar_obj, PageContent) and toolbar_obj.language == language:
             # Already in the toolbar, then use it!
-            return self.toolbar.get_object()
+            return toolbar_obj
         else:
             # Get it from the DB
             return get_latest_admin_viewable_content(self.page, language=language)