diff --git a/Userland/Libraries/LibJS/Runtime/StringIteratorPrototype.cpp b/Userland/Libraries/LibJS/Runtime/StringIteratorPrototype.cpp
index 6e7b70c73c..9e83dc6255 100644
--- a/Userland/Libraries/LibJS/Runtime/StringIteratorPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/StringIteratorPrototype.cpp
@@ -45,7 +45,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringIteratorPrototype::next)
     }
 
     ThrowableStringBuilder builder(vm);
-    builder.append_code_point(*utf8_iterator);
+    TRY(builder.append_code_point(*utf8_iterator));
     ++utf8_iterator;
 
     return create_iterator_result_object(vm, PrimitiveString::create(vm, TRY(builder.to_string())), false);