Foundation/wax ring issues?

I have a previous client who called and now has what she says is mud coming from underneath a toilet in the basement of her home. I verified that this was not sewage and she says it is only mud. Floor is finished so can’t see the concrete. I’m guessing the concrete or the sewer drain must be cracked but was wondering if anyone has seen similar situations? I have never seen or heard of this before.Thanks.

I would reccomend having the toilet removed and check for a proper flange and seal…I have seen plenty of basement toilets just bolted to the slab over the drain with no flange installed…jim