Prefetch custom textures option causes game crash.

I am trying to install the HD texture pack for Melee on the Slippi version of Dolphin. Whenever I select 'prefetch custom textures' the game crashes on launch though. It doesn't crash without it but I want to avoid any stuttering if possible. Does anyone know why this might happen? Sometimes the crash happens directly on launch and others it lets me into the menus before crashing. My computer should be more than capable. I am on linux if that impacts anything. Thanks.