diff --git a/content/base/src/nsRange.cpp b/content/base/src/nsRange.cpp
index 35f93eb1fd41..cdc305289b7e 100644
--- a/content/base/src/nsRange.cpp
+++ b/content/base/src/nsRange.cpp
@@ -813,12 +813,14 @@ nsresult nsRange::PopRanges(nsIDOMNode* aDestNode, PRInt32 aOffset, nsIContent*
               // promote start point up to replacement point
               res = theRange->SetStart(aDestNode, aOffset);
               NS_POSTCONDITION(NS_SUCCEEDED(res), "nsRange::PopRanges() got error from SetStart()");
+              if (NS_FAILED(res)) return res;
             }
             if (theRange->mEndParent == domNode)
             {
               // promote end point up to replacement point
               res = theRange->SetEnd(aDestNode, aOffset);
               NS_POSTCONDITION(NS_SUCCEEDED(res), "nsRange::PopRanges() got error from SetEnd()");
+              if (NS_FAILED(res)) return res;
             }          
           }
           // must refresh theRangeList - it might have gone away!
diff --git a/layout/base/src/nsRange.cpp b/layout/base/src/nsRange.cpp
index 35f93eb1fd41..cdc305289b7e 100644
--- a/layout/base/src/nsRange.cpp
+++ b/layout/base/src/nsRange.cpp
@@ -813,12 +813,14 @@ nsresult nsRange::PopRanges(nsIDOMNode* aDestNode, PRInt32 aOffset, nsIContent*
               // promote start point up to replacement point
               res = theRange->SetStart(aDestNode, aOffset);
               NS_POSTCONDITION(NS_SUCCEEDED(res), "nsRange::PopRanges() got error from SetStart()");
+              if (NS_FAILED(res)) return res;
             }
             if (theRange->mEndParent == domNode)
             {
               // promote end point up to replacement point
               res = theRange->SetEnd(aDestNode, aOffset);
               NS_POSTCONDITION(NS_SUCCEEDED(res), "nsRange::PopRanges() got error from SetEnd()");
+              if (NS_FAILED(res)) return res;
             }          
           }
           // must refresh theRangeList - it might have gone away!