diff --git a/layout/base/crashtests/469861-1.xhtml b/layout/base/crashtests/469861-1.xhtml
new file mode 100644
index 000000000000..6a7888b62fdb
--- /dev/null
+++ b/layout/base/crashtests/469861-1.xhtml
@@ -0,0 +1,15 @@
+
+
+
+
+
+
+
+
+
+
diff --git a/layout/base/crashtests/469861-2.xhtml b/layout/base/crashtests/469861-2.xhtml
new file mode 100644
index 000000000000..295f2c61d41d
--- /dev/null
+++ b/layout/base/crashtests/469861-2.xhtml
@@ -0,0 +1,15 @@
+
+
+
+
+
+
+
+
+
+
diff --git a/layout/base/crashtests/crashtests.list b/layout/base/crashtests/crashtests.list
index ba8a88fa4c13..cd45ba3b1e0e 100644
--- a/layout/base/crashtests/crashtests.list
+++ b/layout/base/crashtests/crashtests.list
@@ -245,6 +245,8 @@ load 468578-1.xhtml
load 468645-1.xhtml
load 468645-2.xhtml
load 468645-3.xhtml
+load 469861-1.xhtml
+load 469861-2.xhtml
load 471594-1.xhtml
load 479114-1.html
load 477333-1.xhtml
diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index 321dcf7601ce..f867d74e978c 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -4629,7 +4629,10 @@ nsCSSFrameConstructor::FindMathMLData(nsIContent* aContent,
// Handle