Shower screw bracket snapped (nothing for screw to hold to)

[JasonStatus]

I have a Mira Vie electric shower and it has come loose at the top (gap between shower back and wall).

I turned the electricity off and opened it up and I took a photo so you can see what I mean.

Can anyone suggest a solution so that I can screw it back to the wall?

At the moment I am relying on a single screw at the bottom of the unit to hold it to the wall (which seems pretty sturdy for now).

I am hoping there is a cheap solution as I don't really have the money to spare for buying a new unit and having someone fit it for me....

Thank you!

[ayjay]

Use a suitable washer on the screw.

[jaeger]

A washer or metal plate shaped - I'd probably but a blob of silicone over the repaired area to try to keep water out too seeing as there's
a hole in the case now
[I'm taking it as read that common sense is used regarding not having metal touch any conductors or come perilously close to doing so]

[arco_iris]

I do appreciate what others have said,but OP probably doesn'thave the facilities to make a shaped plate, or file down a washer to make it the right shape.

I would drill a new hole in the casing, to the side of the mounting shown, and make a new fixing.

OP, what is the wall made of? Is it showerwall laminate or tiles over masonry?