And this is an expected problem with renewables that can be engineered around. It's unlikely the whole world has a drought at once during a calm night, so developing ways to transmit power long distances will be important.
Which absolutely should be done, but having energy sovereignty is never a bad thing.
Having a continent-wide draught (or cold winter or other weather effect) is rather common though. Just a few years back Europe had a massive issue where draught caused both drop of hydro production and cooling for French nukes, causing energy prices to spike.
Or just use nuclear as base load, and battery storage as much as you can.