I faced with that error message one of our 12c database.

This issue is caused by the fix for Bug 22365117, which must be present in the current ORACLE_HOME, and was included in both the 12.1.0.2.170117 (January 2017)

If you check trc file you can notice that The call stack for the error may include:
koxsi2sz kokeaai kokeeco evaopn2 opifcr qerixFetchUniqueIndex
Here is the Workaround 1
Set “_nlj_batching_misses_enabled” = 0 (2021)

Workaround 2

Upgrade your database or if you cant apply latest PSU pathes