diff --git a/api/js/etemplate/et2_core_arrayMgr.js b/api/js/etemplate/et2_core_arrayMgr.js
index 818a9c4567..7ddbbc122d 100644
--- a/api/js/etemplate/et2_core_arrayMgr.js
+++ b/api/js/etemplate/et2_core_arrayMgr.js
@@ -121,7 +121,7 @@ var et2_arrayMgr = /** @class */ (function () {
      * @return {string[]}
      */
     et2_arrayMgr.prototype.explodeKey = function (_key) {
-        if (!_key || _key.trim() === "")
+        if (!_key || typeof _key == 'string' && _key.trim() === "")
             return [];
         // Parse the given key by removing the "]"-chars and splitting at "["
         var indexes = [_key];
diff --git a/api/js/etemplate/et2_core_arrayMgr.ts b/api/js/etemplate/et2_core_arrayMgr.ts
index 17adc7e204..352356b9c3 100644
--- a/api/js/etemplate/et2_core_arrayMgr.ts
+++ b/api/js/etemplate/et2_core_arrayMgr.ts
@@ -125,7 +125,7 @@ export class et2_arrayMgr
 	 * @return {string[]}
 	 */
 	explodeKey(_key: string): string[] {
-		if(!_key || _key.trim() === "") return [];
+		if(!_key || typeof _key == 'string' && _key.trim() === "") return [];
 
 		// Parse the given key by removing the "]"-chars and splitting at "["
 		let indexes = [_key];