ProMods

Hi, everytime i zoom in map my game crashes. I am using Promods +RusMap+SouthernRegion+The great Steppe+Sibir map .

Everything works fine except when i open map and try to zoom in, then game crashes, it doesn't say anything though, just brings me to desktop like i quit game...

This is quite common. Try adding these launch parameters in steam:
-unlimitedlog -mm_max_resource_size 90 -mm_max_tmp_buffers_size 1000 -mm_pool_size (no more than half your ram)
You could also try a map background like one of these: https://roextended.ro/forum/viewtopic.php?f=9&t=20. If that doesn't work post your game.log (found in Documents -> Euro Truck Simulator 2) here by using paste bin or a similar site. I hope this helps

but why this crash suddenly occured, i always used these map combos without any problems and now in 1.40 it crashes when zooming in

I have the same problem, nothing works.

With ProMods, ME and RusMap, in 1.44, I too had that map zoom crash.
For that combo, what fixed it for me, was https://promods.net/viewtopic.php?f=42&t=29618

ProMods Background Map Zoom Crash Fix - Required when using multiple maps or your game may crash when zooming on the world map!
ProMods High Quality Background Map 1.6
you might want to use the other map? -> ProMods High Quality Afroeurasia Background Map 1.2 (suitable when using additional maps not covered by the standard background map)

Have you tested these?