With tension in Ukraine and disappointing numbers coming out of China, some investors are starting to wonder if the reigning bullish sentiment could be set back by world events. While he doesn’t try to predict what will happen in the next year, Berkshire Hathaway Inc. (NYSE:BRK.A) (NYSE:BRK.B) CEO Warren Buffett doesn’t think we have to worry about another crash at least in the next few years. Another crisis will happen in the next fifty years, but not yet: Buffett “It’ll happen again someday, but we’re not remotely close to it happening now. But it will happen again,” said Buffett during an…