[CRASH] When I Select Pantheon...

So, whenever I select Pantheon, my League of Legends stops responding, following my other programs at the same exact time it happens. This then results in a full computer shutdown (this is what I do to solve the problem). Normally, I don't even play Pantheon, I just check what the champions say, or I scroll through random champions. This has happened a total of four times to me, and I want to know if it's just my computer or if it's League of Legends itself.

[SYSTEM SPECS] Model: Toshiba Satellite S55-B Processor: Intel Core i7-4510U @ 2 GHz RAM: 12 GB System: (I don't think this matters, but just in case it does) 64-bit, Windows 8. Manufactured: Apparently in 2013, because that's what the copyright in my System says. This is a Laptop. [END SPECS]