Haha. This hits home. I just got an urgent issue for a customer I can't solve and the only people who can are on holiday, so I'll be looking for the answer from now (afternoon) till long after 2am this night, and I won't be paid for that time either.
But "making it someone else's problem" is... heavily discouraged, shall we say, and since I don't immediately fancy homelessness...
Then tell whoever pays you to do so or figure it out themselves. That's kind of the whole deal with hiring people to do work for you. Unless you're salaried.