SQLiteConstraintException error showing after start of every activity

From this issue opened in the firebase-android-sdk project:

Since it requires an update to play services, I'm holding off from giving you a timeline for when this will roll out. But, this would require no action/SDK upgrades from developers and should get fixed on your customer devices automatically.

i had same issue. my case solved by adding firebase messaging artifactory to module gradle file:

implementation 'com.google.firebase:firebase-messaging:20.2.3'

your case maybe fix by adding missing library.