diff --git a/NEWS b/NEWS
index c817a6ff9..1f16b2283 100644
--- a/NEWS
+++ b/NEWS
@@ -23,6 +23,8 @@ Bug fixes
  - [web] only one postal address of same type is saved (#4091)
  - [web] improve handling of email notifications of a calendar properties
  - [web] fixed XSRF cookie path when changing password (#4139)
+ - [web] spaces can now be inserted in address book names
+ - [web] prevent the creation of empty contact categories
  - [eas] hebrew folders encoding problem using EAS (#4240)
  - [eas] avoid sync requests for shared folders every second (#4275)
 
diff --git a/UI/Templates/PreferencesUI/UIxPreferences.wox b/UI/Templates/PreferencesUI/UIxPreferences.wox
index 6526d63ce..694a6adeb 100644
--- a/UI/Templates/PreferencesUI/UIxPreferences.wox
+++ b/UI/Templates/PreferencesUI/UIxPreferences.wox
@@ -497,6 +497,7 @@
                 <md-input-container class="md-block md-flex">
 	          <input type="text"
                          label:aria-label="Contact Category"
+                         required="required"
                          ng-model="app.preferences.defaults.SOGoContactsCategories[$index]"
                          sg-focus-on="contactCategory_{{$index}}"/>
                 </md-input-container>
diff --git a/UI/WebServerResources/js/Preferences/Preferences.service.js b/UI/WebServerResources/js/Preferences/Preferences.service.js
index 81f253961..860b8d9f2 100644
--- a/UI/WebServerResources/js/Preferences/Preferences.service.js
+++ b/UI/WebServerResources/js/Preferences/Preferences.service.js
@@ -108,6 +108,8 @@
 
       if (angular.isUndefined(data.SOGoContactsCategories))
         data.SOGoContactsCategories = [];
+      else
+        data.SOGoContactsCategories = _.compact(data.SOGoContactsCategories);
 
       angular.extend(_this.defaults, data);
 
diff --git a/UI/WebServerResources/js/Preferences/PreferencesController.js b/UI/WebServerResources/js/Preferences/PreferencesController.js
index 7a4d70646..86180eb83 100644
--- a/UI/WebServerResources/js/Preferences/PreferencesController.js
+++ b/UI/WebServerResources/js/Preferences/PreferencesController.js
@@ -76,8 +76,12 @@
     };
 
     this.addContactCategory = function(form) {
-      this.preferences.defaults.SOGoContactsCategories.push("");
-      focus('contactCategory_' + (this.preferences.defaults.SOGoContactsCategories.length - 1));
+      var i = _.indexOf(this.preferences.defaults.SOGoContactsCategories, "");
+      if (i < 0) {
+        this.preferences.defaults.SOGoContactsCategories.push("");
+        i = this.preferences.defaults.SOGoContactsCategories.length - 1;
+      }
+      focus('contactCategory_' + i);
       form.$setDirty();
     };