diff --git a/cmd/backoffice/main.go b/cmd/backoffice/main.go
index bc570ea..7fd958b 100644
--- a/cmd/backoffice/main.go
+++ b/cmd/backoffice/main.go
@@ -94,7 +94,7 @@ func main() {
 
 	_ = os.MkdirAll(dataDir, 0755)
 
-	reg := cart.NewCartMultationRegistry(nil)
+	reg := cart.NewCartMultationRegistry(cart.NewCartMutationContext(nil))
 	diskStorage := actor.NewDiskStorage[cart.CartGrain](dataDir, reg)
 
 	fs := NewFileServer(dataDir, diskStorage)