diff --git a/src/classes/site.ts b/src/classes/site.ts
index ce3693047..e6190d4c0 100644
--- a/src/classes/site.ts
+++ b/src/classes/site.ts
@@ -376,7 +376,10 @@ export class CoreSite {
      * @param {any} Config.
      */
     setConfig(config: any): void {
-        config.tool_mobile_disabledfeatures = this.textUtils.treatDisabledFeatures(config.tool_mobile_disabledfeatures);
+        if (config) {
+            config.tool_mobile_disabledfeatures = this.textUtils.treatDisabledFeatures(config.tool_mobile_disabledfeatures);
+        }
+
         this.config = config;
         this.calculateOfflineDisabled();
     }