PRINT AT 23,0 and FOR NEXT Loop not working after Fastcall

[Luzie]

you can also PEEK 23610 (ERR_NR). ZX Basic stores the error there. It should be the same number you get when you exit to basic minus 1, so for "0 OK 0:1" the code is 0, so poke it with 255 (which is -1 in 2 complement). That is POKE 23610, 255 before exiting to Sinclair BASIC will clear any error silently.

WOW! Nice trick! This helps me to avoid /clear the error "5 Out of screen". Thank you very much!