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-rw-r--r--layout/base/nsCSSFrameConstructor.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index 866fa148bf..bee9ed6299 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -8296,6 +8296,7 @@ nsCSSFrameConstructor::ContentRemoved(nsIContent* aContainer,
"display:contents nodes shouldn't have a frame");
if (!childFrame && GetDisplayContentsStyleFor(aChild)) {
nsIContent* ancestor = aContainer;
+ MOZ_ASSERT(ancestor, "display: contents on the root?");
while (!ancestor->GetPrimaryFrame()) {
// FIXME(emilio): Should this use the flattened tree parent instead?
ancestor = ancestor->GetParent();