Cannot use STUN: Unsupported address family (PJ_EAFNOTSUP)

In the last days I got toast messages saying "Fail to create transport Unsupported address family (PJ_EAFNOTSUP) (70022).
In the logfile I got "pjsua_core.c Cannot use STUN: Unsupported address family (PJ_EAFNOTSUP) [status=70022]"
I used a preconfigured setting for my provider.