aweful immortal bug

My game froze and because I'm to stupid for this world I clicked on the map, to be more precise on the enemies base. On my screen nothing happend but on my sisters screen I became immortal while standing around and being attacked by multiple minions.... I tried to restart my computer and I finally died on my sisters screen but my game was still frozen and all the minions previously attacking me suddenly were free and able to destroy my teams nexus. I never wanted any of these to happen xc What should I do now?