I just lost my job b/c of theft. i am probation for shoplifting currently. What do i tell my PO about why I lost my job? I dont want to be violated.

i just got fired from my job yesterday for shoplifting. I am currently on misdemeanor probation for petty theft. I’m not sure what to tell my PO about WHY I lost my job w/o getting violated. Should I say that I quit or was fired for another reason. The employer was not aware that I was on probation & have been on for less than a month. What should I say w/o having to get a Violation of Probation?