--- a/editor/libeditor/HTMLEditRules.cpp
+++ b/editor/libeditor/HTMLEditRules.cpp
@@ -5888,17 +5888,20 @@ HTMLEditRules::GetNodesForOperation(
       rv = BustUpInlinesAtRangeEndpoints(*item);
       if (NS_FAILED(rv)) {
         break;
       }
     }
     // Then unregister the ranges
     for (auto& item : rangeItemArray) {
       htmlEditor->mRangeUpdater.DropRangeItem(item);
-      aArrayOfRanges.AppendElement(item->GetRange());
+      RefPtr<nsRange> range = item->GetRange();
+      if (range) {
+        aArrayOfRanges.AppendElement(range);
+      }
     }
     NS_ENSURE_SUCCESS(rv, rv);
   }
   // Gather up a list of all the nodes
   for (auto& range : aArrayOfRanges) {
     DOMSubtreeIterator iter;
     nsresult rv = iter.Init(*range);
     NS_ENSURE_SUCCESS(rv, rv);