diff --git a/UI/WebServerResources/js/Common/sgToggleGrid.directive.js b/UI/WebServerResources/js/Common/sgToggleGrid.directive.js
index fa4ac5b4b..2492321cf 100644
--- a/UI/WebServerResources/js/Common/sgToggleGrid.directive.js
+++ b/UI/WebServerResources/js/Common/sgToggleGrid.directive.js
@@ -29,7 +29,7 @@
             tile,
             ngModelCtrl,
             i,
-            modelDays,
+            modelDays = [],
             modelAttr,
             toggleClass;