1 files changed, 6 insertions, 1 deletions
diff --git a/js/src/builtin/WeakSet.js b/js/src/builtin/WeakSet.js
index eb7c2378f..8589f9dc6 100644
--- a/js/src/builtin/WeakSet.js
+++ b/js/src/builtin/WeakSet.js
@@ -40,7 +40,12 @@ function WeakSetConstructorInit(iterable) {
         var nextValue = next.value;
 
         // Steps 8.d-e.
-        callContentFunction(adder, set, nextValue);
+        try {
+            callContentFunction(adder, set, nextValue);
+        } catch (e) {
+            IteratorCloseThrow(iter);
+            throw e;
+        }
     }
 }