diff --git a/content/html/content/crashtests/741250.xhtml b/content/html/content/crashtests/741250.xhtml
new file mode 100644
index 000000000000..e18a9409fe14
--- /dev/null
+++ b/content/html/content/crashtests/741250.xhtml
@@ -0,0 +1,9 @@
+<input form="f" id="x" xmlns="http://www.w3.org/1999/xhtml">
+<form id="f"></form>
+<script>
+window.addEventListener("load", function() {
+  var x = document.getElementById("x");
+  x.appendChild(x.cloneNode(true));
+}, false);
+</script>
+</input>
diff --git a/content/html/content/crashtests/crashtests.list b/content/html/content/crashtests/crashtests.list
index 08eafc9a5c88..75186d62b47f 100644
--- a/content/html/content/crashtests/crashtests.list
+++ b/content/html/content/crashtests/crashtests.list
@@ -34,3 +34,4 @@ load 682058.xhtml
 load 682460.html
 load 673853.html
 load 738744.xhtml
+load 741250.xhtml
diff --git a/content/html/content/src/nsHTMLFormElement.cpp b/content/html/content/src/nsHTMLFormElement.cpp
index 3bf04572bc2b..91a194965e7a 100644
--- a/content/html/content/src/nsHTMLFormElement.cpp
+++ b/content/html/content/src/nsHTMLFormElement.cpp
@@ -2366,7 +2366,10 @@ nsFormControlList::AddElementToTable(nsGenericHTMLFormElement* aChild,
       // the list in the hash
       nsSimpleContentList *list = new nsSimpleContentList(mForm);
 
-      NS_ASSERTION(content->GetParent(), "Item in list without parent");
+      // If an element has a @form, we can assume it *might* be able to not have
+      // a parent and still be in the form.
+      NS_ASSERTION(content->HasAttr(kNameSpaceID_None, nsGkAtoms::form) ||
+                   content->GetParent(), "Item in list without parent");
 
       // Determine the ordering between the new and old element.
       bool newFirst = nsContentUtils::PositionIsBefore(aChild, content);