diff --git a/UI/WebServerResources/js/Contacts/AddressBook.service.js b/UI/WebServerResources/js/Contacts/AddressBook.service.js
index be3b522bd..14961d859 100644
--- a/UI/WebServerResources/js/Contacts/AddressBook.service.js
+++ b/UI/WebServerResources/js/Contacts/AddressBook.service.js
@@ -458,7 +458,7 @@
 
     // Restart the refresh timer, if needed
     var refreshViewCheck = AddressBook.$Preferences.defaults.SOGoRefreshViewCheck;
-    if (refreshViewCheck && refreshViewCheck != 'manually') {
+    if (refreshViewCheck && refreshViewCheck != 'manually' && !isNaN(refreshViewCheck)) {
       var f = angular.bind(this, AddressBook.prototype.$reload);
       AddressBook.$refreshTimeout = AddressBook.$timeout(f, refreshViewCheck.timeInterval()*1000);
     }
diff --git a/UI/WebServerResources/js/Mailer/Account.service.js b/UI/WebServerResources/js/Mailer/Account.service.js
index 159050f9e..036cae71f 100644
--- a/UI/WebServerResources/js/Mailer/Account.service.js
+++ b/UI/WebServerResources/js/Mailer/Account.service.js
@@ -156,7 +156,7 @@
       });
     });
 
-    if (refreshViewCheck && refreshViewCheck != 'manually') {
+    if (refreshViewCheck && refreshViewCheck != 'manually' && !isNaN(refreshViewCheck)) {
       if (Account.$refreshUnseenCount)
         Account.$timeout.cancel(Account.$refreshUnseenCount);
       Account.$refreshUnseenCount = Account.$timeout(angular.bind(this, Account.refreshUnseenCount, folders), refreshViewCheck.timeInterval()*1000);
diff --git a/UI/WebServerResources/js/Mailer/Mailbox.service.js b/UI/WebServerResources/js/Mailer/Mailbox.service.js
index 456adbdd2..6ab86ff45 100644
--- a/UI/WebServerResources/js/Mailer/Mailbox.service.js
+++ b/UI/WebServerResources/js/Mailer/Mailbox.service.js
@@ -462,7 +462,7 @@
     // Restart the refresh timer, if needed
     if (!Mailbox.$virtualMode) {
       var refreshViewCheck = Mailbox.$Preferences.defaults.SOGoRefreshViewCheck;
-      if (refreshViewCheck && refreshViewCheck != 'manually') {
+      if (refreshViewCheck && refreshViewCheck != 'manually' && !isNaN(refreshViewCheck)) {
         var f = angular.bind(this, Mailbox.prototype.$filter, null, filters);
         Mailbox.$refreshTimeout = Mailbox.$timeout(f, refreshViewCheck.timeInterval()*1000);
       }
diff --git a/UI/WebServerResources/js/Preferences/Preferences.service.js b/UI/WebServerResources/js/Preferences/Preferences.service.js
index b43c43733..0b63710a2 100644
--- a/UI/WebServerResources/js/Preferences/Preferences.service.js
+++ b/UI/WebServerResources/js/Preferences/Preferences.service.js
@@ -587,7 +587,7 @@
       }
     }).finally(function () {
       var refreshViewCheck = _this.defaults.SOGoRefreshViewCheck;
-      if (refreshViewCheck && refreshViewCheck != 'manually')
+      if (refreshViewCheck && refreshViewCheck != 'manually' && !isNaN(refreshViewCheck))
         _this.nextInboxPoll = Preferences.$timeout(angular.bind(_this, _this.pollInbox), refreshViewCheck.timeInterval()*1000);
     });
   };
diff --git a/UI/WebServerResources/js/Scheduler/Component.service.js b/UI/WebServerResources/js/Scheduler/Component.service.js
index 8b19b56c8..6bd6eba76 100644
--- a/UI/WebServerResources/js/Scheduler/Component.service.js
+++ b/UI/WebServerResources/js/Scheduler/Component.service.js
@@ -129,7 +129,7 @@
 
     // Restart the refresh timer, if needed
     var refreshViewCheck = Component.$Preferences.defaults.SOGoRefreshViewCheck;
-    if (refreshViewCheck && refreshViewCheck != 'manually') {
+    if (refreshViewCheck && refreshViewCheck != 'manually' && !isNaN(refreshViewCheck)) {
       var f = angular.bind(Component.$rootScope, Component.$rootScope.$emit, 'calendars:list');
       Component.$refreshTimeout = Component.$timeout(f, refreshViewCheck.timeInterval()*1000);
     }