I can't answer that question definitively, it is outside my immediate professional experience. When you go the doctor who might do the ect, he will know for sure. It probably will not matter because during the ect you are totally protected from having a spontaneous seizure.
But I must tell you that based on LOTS of research looking at ECT from all angles, I wouldn't go through with it period, whether on wellbutrin or not.
God bless.