Occasionally, I get this Resolver error, what's that suppose to mean?

Occasionally, I get this error from the fdbcli status:
Last logged error: ResolverFailed: internal_error at Fri Feb 18 19:25:35 2022
What’s that suppose to mean? The DB seems ok, read/write is ok. Tracking down the issue from trace log seems to fail on this line in the Resolver.actor.cpp line 226
ASSERT(firstUnseenVersion >= self->debugMinRecentStateVersion);
This is for FDB version 6.2.29