Null Reference Exception error when loading into a battle

[RedEagle32]

When loading into a battle in 1984 soviet campaign mode against escorts I sometimes get this error:

Null Reference Exception: Object reference not set to an instance of an object

Enemy_Missile.InitialiseEnemyMissile() Vessel.Start()

It's not game-breaking, in fact, I'm not sure it breaks anything however it is annoying to have to see.