game crash with attempt to index field 'colour' (a nil value)

[PSLLSP]

Ubuntu 18.04 amd64, trAIns 5.3 installed from deb package

Game mode was "compete", map was 30x30, four AI trains running in busy urban area for time challenge at speed x90, three AI already reached limit for trains (90).
Screen size for game is 1680x1050, clouds are off, full screen is off, language is English.

ERROR:
Scripts/console.lua:12: attempt to index field 'colour' (a nil value)

Traceback:

Scripts/errorhandler.lua:39: in function '__index'
Scripts/console.lua:12: in function 'show'
main.lua:713: in function 'draw'
[C]: in function 'xpcall'

BTW, I cannot see any VIP passengers, is it another bug?? I run many games and there were no VIP. After restart, I see VIPs, so there is another bug but I don't know how to replicate it...

[Germanunkol]

Hi,
Thanks for reporting. I've never seen this issue, I think. Has it happened more than once, or only this one time?
Can you recreate it?

I haven't had luck so far.
This should not be the cause, but - could you send me the AIs that you used when you ran into this issue?
germanunkol at gmail.com

[PSLLSP]

Hi, I just replicated the issue. I don't know the exact procedure.

What I do?
I run "compete" of 4 AI in large city (30x30), I run for time and I run it fast (90x). First match ended OK, second match with the error. I do zoom in and zoom out of the city map, I sometimes slow down the process. I get this bug when speed was at 40x.

I noted that there are many random color dots out of city area, dynamic color points, it looks like noise. Maybe those dots are passengers dropped close to city border. I see many of such dots when I zoom out, so I see a lot of dark area around the city map and many small colorful "explosions" in the dark area. I tried to catch such event, so I was checking that dark area at slower speed and I received the error...