diff --git a/modules/menu/tpl/sitemap.html b/modules/menu/tpl/sitemap.html
index 5f4e52e59..f0d489afd 100644
--- a/modules/menu/tpl/sitemap.html
+++ b/modules/menu/tpl/sitemap.html
@@ -2539,6 +2539,8 @@ jQuery(function($){
 			}
 		}
 		
+		// Output of $.param function used in exec_json does not have a representation for an empty array. So, use "[]" (string) instead.
+		if(vValue.length === 0) vValue = "[]";
 		return vValue;
 	}