Fixed in the current ZIP. Also I have run the upgrade on your site.
I think the Fatal Error when enabled occurred if there was another modification besides VaultWiki installed, the modification has a listener at init_dependencies with certain code inside, and its listener executed before VaultWiki's. Because this can potentially lead to unexpected data if VaultWiki was unable to initialize before certain data was fetched (forum info, user info, etc), I have changed the Execution Order of the listener for the next release.