NOT this: (original code)
--------
jump_out_of_range:
        cmp     [error_line],0
      jne     instruction_assembled
       mov     eax,[current_line]
  mov     [error_line],eax
    mov     [error],relative_jump_out_of_range
  jmp     instruction_assembled

;instruction_assembled: (ASSEMBLE.INC)
;    mov     al,[esi]
;   cmp     al,0Fh
;     je      line_assembled
;     or      al,al
;      jnz     extra_characters_on_line
;       .....

BUT: (my proposal)
----
jump_out_of_range:
   cmp     [error_line],0
      jne     instruction_assembled
       mov     eax,[current_line]
  mov     [error_line],eax
    jmp     relative_jump_out_of_range ; ------> end