Star wolves 3 mission problem-New jerusalem 2

[fiju]

OK.. hi to all.. i just rescue that greyhair guy from that wrecked base in BETA LETHERA 1 system and then i folowed the mission to new jerusalem 2
now.. upon entering system i was intercepted buy 3 MSF ships and i killed them and the grey guy told me that he can change ships ID if we can manage to dock or something.. NOW the problem is wherever i go i got intercepted and sudently my mothership wich is Mastiff btw EXPLODES and thats it... did i do something wrong??

help fiju