Bug in CPC engine for CHR command

[oss003]

Bruce Groves found a problem with using the CHR command in the CPC port.
The CPC crashes if a CHR command has to be executed.
I think I found the problem and changed it in the engine in ...\AGD\EngineCPC.asm

; Display a character.

achar  ld b,a              ; copy to b.
      call preprt         ; get ready to print.
      ld a,(prtmod)       ; print mode.
      and a               ; standard size?
      ld a,b              ; character in accumulator.
      jp nz,btxt          ; no, double-height text.
      call ptxt           ; display character.
      call nexpos         ; display position.
      jp z,bchr3      ; next line down. <--- bug
      jp bchr2        ; tidy up. <---------- bug

Greetings
Kees