diff --git a/web/templates/head.html b/web/templates/head.html
index 2578773767..b1ec905b5e 100644
--- a/web/templates/head.html
+++ b/web/templates/head.html
@@ -77,7 +77,9 @@
         window.mm_preferences = {{ .Preferences }};
 
         $(function() {
-            PreferenceStore.setPreferences(window.mm_preferences);
+            if (window.mm_preferences != null) {
+                PreferenceStore.setPreferences(window.mm_preferences);
+            }
         });
 
         if ({{.SessionTokenIndex}} >= 0) {