mark wrapped handlers as wrapped

Author: lobsterkatie

packages/nextjs/src/utils/withSentry.ts

@@ -179,6 +179,10 @@ export const withSentry = (origHandler: NextApiHandler): WrappedNextApiHandler =
     // a promise here rather than a real result, and it saves us the overhead of an `await` call.)
     return boundHandler();
   };
+
+  // Flag the original handler as already having been wrapped, to prevent it from being wrapped twice (which it could
+  // be, if someone has already wrapped it manually and then we come along and auto-wrap it)
+  wrappedHandler.__sentry_wrapped__ = true;
 };
 
 type ResponseEndMethod = AugmentedNextApiResponse['end'];