Minecraft crashes when loading a server

As previously stated, minecraft crashes with no known cause, my system can handle it and it ran fine before, even tho I don't know what changed now (I played it the day before writing this). On some servers I manage to enter the server but when I do it crashes, but on others it just simply crashes when it gets to the "Loading terrain" screen. It doesn't give me an error report adn I don't have a clue what could it be, so if possible please help, thank you.