Propaganda Towers have a race condition at shutdown / reset.

[Mauller]

This likely affects other objects that grant upgrades / bonuses to objects within their area of influence.

But when propaganda tower objects are deleted their PropogandaTowerBehaviour modules onDelete function is called which will call removeAllInfluence. This then goes through an internal list of objects that it believes to be within its area of influence to remove any upgrades it is providing.

This obviously causes an access violation if the object pointed to no longer exists during game reset.

[Mauller]

So this issue came up due to the reordering of clearing the vector lookup table in game logic.

The underlying issue is that the subsystem destruction ordering destroys the player first which the propaganda tower checks to see if certain upgrades have been created. This then throws a memory access violation. This occurs when the module gets a valid object and then checks if it is valid to remove the affect on the object.

Reverting the order of clearing the lookup table to the original ordering and adding a range check when removing objects from the lookup table clears this issue. This is due to the propaganda module getting the object by ID and only getting null back, so it no longer enters the invalid code path.