Hello!
I ran into this as well: Kawase Dual filter post by ROJO (@ayoROJO) / X
This is due to the DualKawaseFilter for slate blur added in 5.7.
The implementor was a contractor and can’t fix it, but says he could report the issue.
Try setting UI.SlatePostBlurUseDualKawaseFilter=0 to disable this new shader and it should fix your crash.