diff --git a/ts/smartdata.classes.collection.ts b/ts/smartdata.classes.collection.ts
index aeacc2d..00d29cf 100644
--- a/ts/smartdata.classes.collection.ts
+++ b/ts/smartdata.classes.collection.ts
@@ -83,7 +83,9 @@ export function Manager<TManager extends IManager>(managerArg?: TManager | TDela
       }
       public static get manager() {
         let manager: TManager;
-        if (managerArg['db']) {
+        if (!managerArg) {
+          manager = this.prototype.defaultManager
+        } else if (managerArg['db']) {
           manager = managerArg as TManager;
         } else {
           manager = (managerArg as TDelayed<TManager>)();
@@ -92,7 +94,9 @@ export function Manager<TManager extends IManager>(managerArg?: TManager | TDela
       }
       public get manager() {
         let manager: TManager;
-        if (managerArg['db']) {
+        if (!managerArg) {
+          manager = this.defaultManager
+        } else if (managerArg['db']) {
           manager = managerArg as TManager;
         } else {
           manager = (managerArg as TDelayed<TManager>)();