I can't quite see from your photo exactly what's wrong, but I've had issues sometimes with the terminator piece of the kill wire on Husqy saws. Sometimes it doesn't want to slide in place, sometimes it goes in but won't stay there due to vibration while saw is running. (Had a 346 that needed to be choked to kill it.)
Two things I've done to fix said issue. If the piece wiggles loose, use a small, tuning size screwdriver to spread open the end of the metal to fashion a tighter fit.
If the metal end needs replacing, I've cut the kill wire and spliced on a longer length with a new end that will serve.