Two or three times, my M1 MBP has crashed overnight, but with the same error - something involving external drives. I keep 6-7 external drives connected at all

Two or three times, my M1 MBP has crashed overnight, but with the same error - something involving external drives. I keep 6-7 external drives connected at all times via two chained hubs. Hard to know if it's the OS or a flakey drive. Beside that, it's been fine though.