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-rw-r--r--js/src/vm/ProxyObject.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/js/src/vm/ProxyObject.cpp b/js/src/vm/ProxyObject.cpp
index 49ed5a6241..69b4cd952f 100644
--- a/js/src/vm/ProxyObject.cpp
+++ b/js/src/vm/ProxyObject.cpp
@@ -45,7 +45,7 @@ ProxyObject::New(JSContext* cx, const BaseProxyHandler* handler, HandleValue pri
// wrappee. Prefer to allocate in the nursery, when possible.
NewObjectKind newKind = NurseryAllocatedProxy;
if (options.singleton()) {
- MOZ_ASSERT(priv.isGCThing() && priv.toGCThing()->isTenured());
+ MOZ_ASSERT(priv.isNull() || (priv.isGCThing() && priv.toGCThing()->isTenured()));
newKind = SingletonObject;
} else if ((priv.isGCThing() && priv.toGCThing()->isTenured()) ||
!handler->canNurseryAllocate() ||