Oct 26 11:36:10 IDP[6695]: 3 [f1b9757f3e] Caused by: TypeError: Return value of SimpleSAML\Module\ratelimit\Limiters\UserPassBaseLimiter::getCurrentCount() must be of the type int, object returned
To me, this only seems possible if an object was stored in the first place, but I don't see how that could happen. The store used is memcached.