Looks like i found a bug, huh. When i opened heavy trooper barracks in "blue" fraction and pressed "build" button than it happened this:
RUNTIME ERROR LINE 39 TAB 0 _D7:_BN() ATTEMPT TO INDEX GLOBAL '_D7' (A NIL VALUE)
IN _BN LINE 39 (TAB 0)
IN _UPDATE60 LINE 671 (TAB 0)
AT LINE 0 (TAB 0)