Cities: Skylines (Steam) - An Error Occurred [System.NullReferenceException], post-1.16.1-f2 after running my city for a while

[yudude]

Describe your issue
An Error Occurred [System.NullReferenceException], post-1.16.1-f2 after running my city for a while

What is your game version?
1.16.1-f2

What expansions do you have installed?
After Dark, Snowfall, Mass Transit, Green Cities, Parklife, Industries, Campus, Sunset Harbor, Airports

What mods are you using?
Harmony 2.2.2-0
TME 11.7.4.0
Broken Nodes Detector
Zoom it
Network Anarchy
Real Time
81 Tiles 2
More Vehicles
Optimized Outside Connections
Parking Lot Roads
Parking Lot Snapping
Patch Loader
FPS Booster
Demand Controller
Extra Landscaping tools
CSL Show more limits
Compatibility Report v2.3.2

Please explain your issue is in as much detail as possible.
Since release of 1.16.1-f2, running my city for an uncertain amount of time will always hit this error message.

The error message doesn't freeze the game outright, but after occurring once it will continuously reappear at set short intervals.

I have tried the following troubleshoot checks:
1. Starting fresh from the original pre-update save with the same mods enabled: the same error occurs eventually, though not necessarily after the same amount of in-game time has passed.
2. Running the last post-update autosave before the error message occurrence, unsubscribing from mods one-by-one to check if the error message occurs. In each test run the error still occurs after a set amount of time, even after reducing the subscribed mods to "More Vehicles" only (this mod is essential to even be able to load the city).

Can you replicate the issue? If yes, please explain how you did it.
My last post-update autosave before the error message occurrence will always hit the error after a set amount of time, suggesting that it is deterministic in that game-state.

The attached output.log file is from running that last autosave.

Attachments File(s) attached

 

[Lucododosor]

A few simulation errors there. Please try these steps:

• Subscribe to the Loading Screen Mod if you haven't already and enable it in Content Manager
• Go to Main Menu > Options and select the Loading Screen Mod in the list on the left
• In the mod's settings, under "General", select all boxes under Safe Mode and under "Try to recover from simulation error"
• Load the game and, if that works, save it as a new file
• Restart the game, disable the Safe Mode and load the save (the new file) again

 

[Sleepy334]

@yudude,

Your game is crashing in:

TransportStationAI.CreateIncomingVehicle

This is because the new H&T patch changed this function but unfortunately it now has a bug where the function doesn't check if an object is null before accessing it. I had the exact same bug and have patched it in Transfer Manager CE, if you run that mod then it will fix the issue for you till CO can release a patch.

If you don't want to run mods or Transfer Manager CE for whatever reason, then I found the object was null for bus stations from the Steam workshop so you could try removing any of those that you have in your city, but running the mod would be the most reliable.

Sleepy

 

[Sleepy334]

Note: This is the exact same bug as dacity3000 reported.

 

[yudude]

Enabling TMCE indeed appears to fix the issue, thanks Sleepy