Skipping Results with Errors in a Loop

I'm estimating models using lme in a for loop. Sometimes the model
doesn't converge or there are other problems. This causes the evaluation
to stop prematurely. I can't remember the function name that I need to
use to allow the loop to continue until the end. Could someone remind me
the name of the function? I've tried searching but haven't hit upon the
function.

Rick B.