Tldr; Did Jews open gates in Spain to let in Muslim invaders?

Hello everyone! A while ago, saw a Spaniard posting about how much he detested Jews. I asked him why, and he responded something along the lines of "The Jews opened the gates for the Muslim invaders." I was really confused because I never heard that before. I've heard the classic antisemitic they're just bad people or greedy or whatever, but never this. Is there any truth to this? Obviously I know even I there was, that was a long time ago and we aren't responsible for the sins of our ancestors since then we'd probably all be in jail.

Thank you!