Chris Brown's Baby Mama I Don't Trust Him Alone With Royalty

Chris Brown's baby mama fears for the safety of their daughter when she's alone with him ... so she's asking a judge to ONLY allow him to see 1-year-old Royalty when someone else is around.

We're told Nia Guzman just filed the legal docs for supervised visitation. Chris has filed his own docs to establish paternity so he can fight for joint custody, but so far the judge has not ruled.

We're told Guzman wants full custody because she thinks Chris is simply too irresponsible to care for a kid on his own and she believes he and his friends all have

substance abuse issues. He thinks it's all just a ploy to get more child support.

So much for working things out without a court order.

source:Tmz