diff --git a/mozilla/layout/base/nsCSSFrameConstructor.cpp b/mozilla/layout/base/nsCSSFrameConstructor.cpp
index eac0d9744e7..98d023be9e4 100644
--- a/mozilla/layout/base/nsCSSFrameConstructor.cpp
+++ b/mozilla/layout/base/nsCSSFrameConstructor.cpp
@@ -5406,8 +5406,8 @@ nsCSSFrameConstructor::ContentAppended(nsIPresContext* aPresContext,
       // WipeContainingBlock because it will throw away the entire selct frame and 
       // start over which is something we do not want to do
       //
-      nsCOMPtr<nsIDOMHTMLSelectElement> selectContent(do_QueryInterface(blockContent));
-      if (selectContent) {
+      nsCOMPtr<nsIDOMHTMLSelectElement> selectContent(do_QueryInterface(aContainer));
+      if (!selectContent) {
         if (WipeContainingBlock(aPresContext, state, blockContent, adjustedParentFrame,
                                 frameItems.childList)) {
           return NS_OK;
diff --git a/mozilla/layout/html/style/src/nsCSSFrameConstructor.cpp b/mozilla/layout/html/style/src/nsCSSFrameConstructor.cpp
index eac0d9744e7..98d023be9e4 100644
--- a/mozilla/layout/html/style/src/nsCSSFrameConstructor.cpp
+++ b/mozilla/layout/html/style/src/nsCSSFrameConstructor.cpp
@@ -5406,8 +5406,8 @@ nsCSSFrameConstructor::ContentAppended(nsIPresContext* aPresContext,
       // WipeContainingBlock because it will throw away the entire selct frame and 
       // start over which is something we do not want to do
       //
-      nsCOMPtr<nsIDOMHTMLSelectElement> selectContent(do_QueryInterface(blockContent));
-      if (selectContent) {
+      nsCOMPtr<nsIDOMHTMLSelectElement> selectContent(do_QueryInterface(aContainer));
+      if (!selectContent) {
         if (WipeContainingBlock(aPresContext, state, blockContent, adjustedParentFrame,
                                 frameItems.childList)) {
           return NS_OK;