That isn't a bug, there are a few possible reasons as to why that's happening: it's a hardware related issue, Possibly your trying to play on a corrupted a corrupted world, Playing a 1.8 world in 1.9; but to find out for sure what's happening, copy and past the crash report log into the description, the mods will then help you out from there.
That isn't a bug, there are a few possible reasons as to why that's happening: it's a hardware related issue, Possibly your trying to play on a corrupted a corrupted world, Playing a 1.8 world in 1.9; but to find out for sure what's happening, copy and past the crash report log into the description, the mods will then help you out from there.