diff --git a/src/main/cluster-manager.ts b/src/main/cluster-manager.ts
index 0a33fd8408..56ce234e90 100644
--- a/src/main/cluster-manager.ts
+++ b/src/main/cluster-manager.ts
@@ -183,7 +183,7 @@ export class ClusterManager extends Singleton {
       } else {
         cluster.kubeConfigPath = entity.spec.kubeconfigPath;
         cluster.contextName = entity.spec.kubeconfigContext;
-        cluster.accessibleNamespaces = entity.spec.accessibleNamespaces;
+        cluster.accessibleNamespaces = entity.spec.accessibleNamespaces ?? [];
 
         this.updateEntityFromCluster(cluster);
       }