Every time I want to play League I get bugsplat

When I first download and patch the client everything is fine, but when I want to open it the next day to play I can log in but then it says "reconnecting" and the client just closes and bugsplat appears. It's really frustrating when I have to reinstall every time I want to play a game of league, it's even worse than before. Does anyone have the same problem or do you know how to fix this? I'm on a mac by the way.
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