Sources connected with the show tell TMZ the crew is grumbling ... worried they will be the financial casualties of Charlie's problem. There are 300 people associated with the show, many of whom are nervous about not getting a paycheck.
Sources say when production was halted last February while Charlie was in rehab, the crew was "partially compensated."
We're told the studio hasn't decided what to do this time around -- whether the staff will be fully or partially compensated. A decision is expected soon.
That said ... everyone we've spoken with is supportive of Charlie and knows he needs to get better, which ultimately will be the best job security.