Internal Error running a block: Error parsing response body

💬 Workflows
1
  1. My goal: Periodically validate FCM device tokens.
  2. Issue: Internal Error running a block: Error parsing response body. Loop throws an error when executing a sequential loop with Firebase Lambda. Works in parallel loops, but I have to match the device ID array, so a sequential loop is needed, I believe.
  3. Steps I've taken to troubleshoot: Internal Error
  4. Additional info: (Cloud-hosted, Screenshots)

Member Device Check.json (20.2 KB)

Screenshot 2025-11-21 at 12.39.21 PM
Screenshot 2025-11-21 at 12.39.21 PM2424×1012 485 KB

4

Do we have a fix for this yet? This is a major blocker for us.

5

Hi @Stanley_Stancavage,

Are you able to share the workflow ID and a workflow run ID from one of the failing runs?

Does the loop fail on the first loop?

Could you elaborate more on why you believe you need to run the loop in 'sequential' mode instead of 'parallel' mode? From the screen shot it appears that you should be able to use the 'Filter by' input field in both options.

6

Can you share a screenshot of your run history? A screenshot of the error message would be very helpful as well.