"amplifyPush --simple" results in "SyntaxError: Unexpected token b in JSON at position 0" error

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Describe the bug “amplifyPush --simple” command in my pipeline results in “SyntaxError: Unexpected token b in JSON at position 0” error. This happens only when I let AWS Amplify Console build my backend, NOT when I run “amplify push” locally.

Amplify CLI Version 4.26.0

To Reproduce Issue happens when I run “git push”, and the AWS Amplify Console starts to run “amplifyPush --simple”.

backend:
  phases:
    build:
      commands:
        - amplify --version
        - amplifyPush --simple

Expected behavior Just like when doing a local “amplify push”, there should not be an error when pushing the resources to the cloud.

Screenshots This is the logs from the AWS Amplify Console. Looks like a JSON.parse issue at the amplifyUtils.ts file of graphql-transformer-core.

        # Starting phase: build
        # Executing command: amplify --version
[INFO]: 4.26.0
[INFO]: # Executing command: amplifyPush --simple
[INFO]: 
[INFO]: For more information on AWS Profiles, see:
        https://docs.aws.amazon.com/cli/latest/userguide/cli-multiple-profiles.html
[INFO]: Amplify AppID found: ... Amplify App name is: ...
[INFO]: Backend environment ... found in Amplify Console app: ...
[INFO]: 
[WARNING]: - Fetching updates to backend environment: ... from the cloud.
[WARNING]: ✔ Successfully pulled backend environment ... from the cloud.
[WARNING]: ✖ An error occurred when pushing the resources to the cloud
[WARNING]: ✖ There was an error initializing your environment.
[INFO]: Failed to pull the backend.
[INFO]: Unexpected token b in JSON at position 0
[INFO]: SyntaxError: Unexpected token b in JSON at position 0
        at JSON.parse (<anonymous>)
        at ensureMissingStackMappings (/root/.nvm/versions/node/v10.16.0/lib/node_modules/@aws-amplify/cli/node_modules/graphql-transformer-core/src/util/amplifyUtils.ts:150:40)
[ERROR]: !!! Build failed
[ERROR]: !!! Non-Zero Exit Code detected
[INFO]: # Starting environment caching...
[INFO]: # Uploading environment cache artifact...
[INFO]: # Environment caching completed
Terminating logging...

Desktop (please complete the following information):

• OS: Mac
• Node Version. v14.4.0

Additional context This happened twice, but on the third attempt, it worked. I did not make any changes to the graphql file. I just made changes to CHANGELOG and pushed just to trigger the pipeline.

[WARNING]: - Fetching updates to backend environment: ... from the cloud.
[WARNING]: ✔ Successfully pulled backend environment ... from the cloud.
[INFO]: GraphQL schema compiled successfully.

[SwaySway]

I’ll transfer this issue over to Amplify Console repo so they can further help you should you run into this issue again.

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