This has been fixed (as of 1.90)

For B_Boat_Armed_01_minigun_F and I_Boat_Armed_01_minigun_F
RearTurret uses "LMG_Minigun", has FCS zeroing but probably shouldn't
No crash on these, (they have a non-empty discreteDistance)
they are manually zeroable and show lazed zero distance, which seems odd

Demo mission:

Seems to be fixed in 1.62

Important reproduction step is that this has to be a saved mission.

Problem seems to be caused by saving missionConfigFile in an array during preInit.
Crash can be reproduced with vanilla + a mod with just

class CfgFunctions {

class PABST {
    class test {
        class crashGAme {
            file = "pabst_test\preInit.sqf";
            preInit = 1;
        };
    };
};

};

which does

diag_log text "PABST PRE_INIT";
x3 = [missionConfigFile];
diag_log text "PABST saved missionConfigFile in x3";

Probable cause of the error messages seems to be that missionConfigFile doesn't always exist when exiting from in-game back to threeden editor.

eg isClass missionConfigFile = false

But handling this doesn't seem to fix crash.