diff --git a/src/services/ngx-ins-utils.ts b/src/services/ngx-ins-utils.ts
index ce53e51b..85a84022 100644
--- a/src/services/ngx-ins-utils.ts
+++ b/src/services/ngx-ins-utils.ts
@@ -7,10 +7,10 @@ export function resolveContainerElement(
   fromRoot: boolean
 ): any {
   const hasWindow = window && !!window.document;
-  const containerIsString =
-    selector && hasWindow && typeof selector === 'string';
   let container = hasWindow && scrollWindow ? window : defaultElement;
-  if (containerIsString) {
+  if (selector) {
+    const containerIsString =
+      selector && hasWindow && typeof selector === 'string';
     container = containerIsString
       ? findElement(selector, defaultElement.nativeElement, fromRoot)
       : selector;