diff --git a/js/src/builtin/ModuleObject.cpp b/js/src/builtin/ModuleObject.cpp
index 3fc195499f..dd03017fc0 100644
--- a/js/src/builtin/ModuleObject.cpp
+++ b/js/src/builtin/ModuleObject.cpp
@@ -973,6 +973,9 @@ ModuleObject::instantiateFunctionDeclarations(JSContext* cx, HandleModuleObject
             }
         }
 
+        if (!obj)
+            return false;
+
         value = ObjectValue(*obj);
         if (!SetProperty(cx, env, funDecl.name->asPropertyName(), value))
             return false;