Yes you must have a broken cable. Most likely the Z-band broke off.
I thought you were talking about the cable coming off at the bottom, not the top.
A make-shfit fix could be to take a piece of wire and bend it around the end of the cable. then poke ithe wire throught the hole that the z-bend was supposed to go through and twist it together to keep it in the hole..
Most likely the cable will now be too long because of the elngth of the wire. One solution is to tie a knot in the cable, this will shorten the cable. You may have to try several different lengths of wire until you get one the right length to put the correct tension on the belt......
You could make a loop or a knot on the end of the cable. This wil do two things, it will shorten the cable and it will give you a place to put either a spring or a wire through.
Remember, this is just a temporary fix.
You might just remove the cable from both ends and run a wire or a rope up the handle and connect it. Make sure that you reder the new cable as soon as you can because with this winter ewather, these parts are getting sold out fast.