Lost all of my Sims due to a mod glitch

I was playing the Sims 4 normally and making a new household, After creating the new household and going to place it in my world, I got a pop-up from **bleep** saying it couldn't create the new sim and to restart the game. When i restarted the game, all of my sims had been deleted. All of the houses i made were still there, and the ones that had been saved to my gallery were still there, but all of my households were completely gone. I had an outdated version of the mod that i had forgotten to replace, which i think is what caused it. Is there any way to get all of my Sims back, or do i just have to start from scratch? Anything helps!