If you enter recovery mode (hold all 4 arrows on gamecube controller 4, unless you changed the button combo with a Priiloader* or StartPatch patch) you can autoboot a disc with the titleID starting with a 0, which apart from working around the fault, you can use Smash Stack or other game exploits# to run homebrew to solve the issue
* why are you bothering with this method then?
# by running as many autoboot-patched discs to fill the nand, so the next game to save will open the Wii Menu directly on the data management screen, from where you can install a traditional save exploit
(if you have a trucha-enabled Wii Menu IOS you can also run a homebrew disc via recovery in the first place, of course one with a titleid starting in 0)