message: Do not search for subscribe method if it is not an object
diff: @@ -709,7 +709,7 @@ export class GraphQLModule<Config = any, Session = any, Context = any> {
  return resolver.call(typeResolvers, root, moduleContext, info);
  };
  }
  - } else if ('subscribe' in resolver) {
  + } else if (typeof resolver === 'object' && 'subscribe' in resolver) {
  const subscriber = resolver['subscribe'];
  typeResolvers[prop]['subscribe'] = async (root: any, args: any, appContext: any, info: any) => {
  const session = info.session || appContext.session;
  