diff --git a/mozilla/layout/generic/crashtests/394237-1.html b/mozilla/layout/generic/crashtests/394237-1.html
new file mode 100644
index 00000000000..53bbc16f686
--- /dev/null
+++ b/mozilla/layout/generic/crashtests/394237-1.html
@@ -0,0 +1,38 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<style>
+
+body {
+  height: 50px;
+  -moz-column-count: 2;
+}
+.container {
+  height: 10px;
+}
+.overflow {
+  height: 100px;
+}
+.bb {
+  border-bottom: solid 4px magenta;
+}
+
+</style>
+
+<script>
+
+function boom()
+{
+  document.getElementById("x").setAttribute("class", "");
+  document.getElementById("y").setAttribute("class", "bb");
+}
+
+</script>
+</head>
+
+<body onload="boom();">
+  <div class="container"><div class="overflow" id="x"></div></div>
+  <div id="y"></div>
+  <div class="container"><div class="overflow"></div></div>
+</body>
+  
+</html>
diff --git a/mozilla/layout/generic/crashtests/crashtests.list b/mozilla/layout/generic/crashtests/crashtests.list
index 41b9fb52870..d5f8ea2b633 100644
--- a/mozilla/layout/generic/crashtests/crashtests.list
+++ b/mozilla/layout/generic/crashtests/crashtests.list
@@ -83,6 +83,7 @@ load 393956-1.html
 load 393956-2.html
 load 393956-3.html
 load 393956-4.html
+load 394237-1.html
 load 394820-1.html
 load 395450-1.xhtml
 load 397187-1.html
