This is a KNOWN and documented bug since SU14. Frame Generation has completely been bugged. Even if you turn FG on, then off in the menu, it CTD with the “graphics” bug pop-up.
We’ve also had several document the FG and it’s stutters and shakiness where at this point, on a 4090, i9-13900k, using frame gen is nearly pointless since SU14 launched.
OP - please vote here, the more votes the more Asobo will see this and fix it.