diff --git a/mozilla/content/xul/templates/src/nsXULSortService.cpp b/mozilla/content/xul/templates/src/nsXULSortService.cpp
index 9316d62c5a5..e6f31cfc212 100644
--- a/mozilla/content/xul/templates/src/nsXULSortService.cpp
+++ b/mozilla/content/xul/templates/src/nsXULSortService.cpp
@@ -684,9 +684,9 @@ getNodeValue(nsIContent *node1, nsIRDFResource *sortProperty, sortPtr sortInfo,
 	nsresult		rv;
 
 	cellVal1 = "";
-	if (NS_SUCCEEDED(rv = node1->QueryInterface(kIDomXulElementIID, (void **)&dom1)))
+	if (NS_SUCCEEDED(rv = node1->QueryInterface(kIDomXulElementIID, (void **)&dom1)) && (nsnull != dom1))
 	{
-		if (NS_SUCCEEDED(rv = dom1->GetResource(&res1)))
+		if (NS_SUCCEEDED(rv = dom1->GetResource(&res1)) && (nsnull != res1))
 		{
 			if ((sortInfo->naturalOrderSort == PR_FALSE) && (sortInfo->sortProperty))
 			{
diff --git a/mozilla/rdf/content/src/nsXULSortService.cpp b/mozilla/rdf/content/src/nsXULSortService.cpp
index 9316d62c5a5..e6f31cfc212 100644
--- a/mozilla/rdf/content/src/nsXULSortService.cpp
+++ b/mozilla/rdf/content/src/nsXULSortService.cpp
@@ -684,9 +684,9 @@ getNodeValue(nsIContent *node1, nsIRDFResource *sortProperty, sortPtr sortInfo,
 	nsresult		rv;
 
 	cellVal1 = "";
-	if (NS_SUCCEEDED(rv = node1->QueryInterface(kIDomXulElementIID, (void **)&dom1)))
+	if (NS_SUCCEEDED(rv = node1->QueryInterface(kIDomXulElementIID, (void **)&dom1)) && (nsnull != dom1))
 	{
-		if (NS_SUCCEEDED(rv = dom1->GetResource(&res1)))
+		if (NS_SUCCEEDED(rv = dom1->GetResource(&res1)) && (nsnull != res1))
 		{
 			if ((sortInfo->naturalOrderSort == PR_FALSE) && (sortInfo->sortProperty))
 			{