Crash when destroying opponent headquarters

[senneschall]

My soldiers killed the last defender and went to the entry of the opponent headquarter. The moment my soldier reaches the entrance, the game crashed without any notice.

Here's the log:
15:38:04 Error: [Game] Failed to remove road segment at position 3962 direction DownRight.
15:38:04 Error: [Game] Failed to remove road segment at position 184 direction DownRight.
15:38:04 Error: [Application] Render: [Serf] Object reference not set to an instance of an object.

I can't provide more detail as the game doesn't provide me with more.