LSL6 break to debugger when calling bad numbers

[RayKoopa]

• ScummVM 2.7.0git75-g8b94209d365 (Jun 7 2022 09:02:26)
• Game language: English
• Game version: Hi-Res 1.000.000
• Windows 11 21H2 10.0.22000.675

Steps to "reproduce" (seems to happen randomly, however):

• Repeatedly call a wrong number with Larry's room phone which generates a generic "bad number" reply.
• The game may break into the debugger stating:

  ERROR:
  parameter 0: 0000:0000 (null, integer), should be reference
  [VM] kArrayDuplicate: signature mismatch in method Print::addTitle (room 620, 
  script 64921, localCall ffffffff)!
  

Since this seems to happen randomly, I can only provide context which I believe is required to trigger it:

• Ensure text display is on.
• May require the text display to have scrolled away a few lines.
• May not require usage of easter egg phone number (they're listed ​here if you want to try them).
• The final problematic always seems to be one creating a generic "bad number" reply (there are 2, one from the narrator, one from the phone system).

I captured one attempt succeeding in breaking the game ​here though I also had it happen with far less "setup" and calls required (in fact, I stumbled upon it by random):

I tried to reproduce this in DOSBox, but couldn't make it happen.

[RayKoopa]

Add context on scrolled away lines.