Chain coming off jockey wheel

There's no problem when riding the bike but when I'm cleaning the chain and turning the pedals backwards the chain comes off the jockey wheel.
It's an old Claud Butler with Shimano gears with the levers on the down tube. The derailleur looks as if it may have got bent out of line at some stage. I was wondering if a new one is needed?
It's an old Claud Butler with Shimano gears with the levers on the down tube. The derailleur looks as if it may have got bent out of line at some stage. I was wondering if a new one is needed?
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