The other (likely) possibility is the system has lost the key to decrypt your credentials so they got wiped. In 0.18.0-0.18.5 (or maybe .6) we would stop your flows in this scenario and require you to manually recover the system. This caused too many complaints so a fix was made to restore the pre0.18 behaviour where it continues to run without your credentials.
If you hadn’t set
credentialSecret in your settings file, then it generates a secret and stores it in
.config.json under the key
_credentialSecret. Something must have happened to your .config.json file for the _credentialSecret to have been lost - and as it was a system generated one, once its gone, its gone.
So you may well have to re-enter your credentials again. But before you do, make sure you have set
credentialSecret in your settings file to some known value and then restart Node-RED. That way you will have the key to decrypting your credentials and not rely on the system generated one.