ATC - random bug

Hello,

I have LCNC 2.9 Branche. I made remap M6.
If I make several M6 TX command, sometimes it returns this bug:
 

My biggest problem is, that this bug is random.

Here is my files for Remap:
REMAP = M6  modalgroup=6  prolog=change_prolog ngc=atc epilog=change_epilog
 
 
 
 
 

Message is here:
github.com/LinuxCNC/linuxcnc/blob/160c55...nterp_o_word.cc#L825

Is it my bug? Is it LCNC bug?

I don't know how to continue looking for a bug. I would like to ask for help.

Sometime it add:
mdi_execute_abort: dropping 1 queued MDI commands
 

In interpreter source code is function:
This function contain messages. Is it possible to display these messages, for example, in the terminal?