My site shows “There has been a critical error on this website”, can you fix it?

Yes. That generic message is WordPress’ fatal-error handler hiding the real PHP error. We enable WP_DEBUG_LOG, read the actual fatal in wp-content/debug.log, and trace it to the failing plugin, theme, or snippet, usually a function conflict or an incompatible update. Then we fix the real cause rather than just deactivating the plugin and leaving your store missing a feature.