App crashes with Exception "Undefined is not an object evaluating (_a.observer)"

[agliber]

Bug report

App crashes with Exception "Undefined is not an object evaluating (_a.observer)"

• This seems to be happening before/after subscription timeout. It doesn't seem to be triggered by a specific action or event but rather happens after a duration from initial subscription connection.

• Expected behavior: The app shouldn't crash and subscription should either not be disconnecting or should attempt to reconnect after disconnect.

Tested on iPhone/iOS 13 and 14

"react-apollo": "^3.1.5",
"react-native": "^0.63.2",
"@apollo/client": "^3.1.3",
"amplify": "0.0.11",
"aws-amplify": "^3.0.24",
"aws-amplify-react-native": "^4.2.5",
"aws-appsync": "^3.0.4",
"aws-appsync-auth-link": "^2.0.2",
"aws-appsync-react": "^3.0.4",
"aws-appsync-subscription-link": "^3.0.3",

This problem existed with previous versions of aws-appsync and did not arise after updating to a new version.

[agliber]

Possible related issues: #501, #515, #595

[KvNGCzA]

These PR1 & PR2 have been opened with related fixes.