Problem when star destroyed

I develeoped the tech to destroy stars. The first time it worked. The second time there was a big problem. It destroyed the star but it didn't mention it in the events after the turn was over. And it had a crosshair image on the system, (on the quadrant map), like when my ship is in an enemy system. I clicked on it and it took a little while and then the game crashed and a message came up with either "invalid cell" or "invalid call" I don't remember which. Also afterwards all of my systems were hidden from me, until I reloaded from a saved game. It was like I had not explored my own systems.