diff --git a/main.go b/main.go
index 8eb9e5d..04ab7cf 100644
--- a/main.go
+++ b/main.go
@@ -31,6 +31,7 @@ import (
 	_ "k8s.io/client-go/plugin/pkg/client/auth"
 	"k8s.io/client-go/rest"
 	controllercache "sigs.k8s.io/controller-runtime/pkg/cache"
+	"sigs.k8s.io/controller-runtime/pkg/client"
 
 	"k8s.io/apimachinery/pkg/runtime"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
@@ -141,6 +142,7 @@ func setupManager(
 		LeaderElectionID:       "f5d1781e.snappcloud.io",
 		// limit Manager to cerberus namespace
 		NewCache: func(config *rest.Config, opts controllercache.Options) (controllercache.Cache, error) {
+			opts.ByObject = make(map[client.Object]controllercache.ByObject)
 			opts.ByObject[&v1.Secret{}] = controllercache.ByObject{
 				Namespaces: map[string]controllercache.Config{
 					"cerberus-operator-system": {},