diff --git a/frontend/app/scripts/controllers/admin/AdminCustomFieldDialogCtrl.js b/frontend/app/scripts/controllers/admin/AdminCustomFieldDialogCtrl.js
index 6d66f03728..a0a8172d9e 100644
--- a/frontend/app/scripts/controllers/admin/AdminCustomFieldDialogCtrl.js
+++ b/frontend/app/scripts/controllers/admin/AdminCustomFieldDialogCtrl.js
@@ -97,12 +97,11 @@
         };
 
         self.onNamechanged = function(form) {
-            if (!self.customField.displayName) {
+            if (self.customField.id || !self.customField.displayName) {
                 return;
             }
 
             var name = s.trim(s.slugify(self.customField.displayName));
-            //name = name.charAt(0).toLowerCase() + name.slice(1);
 
             self.customField.name = name;
 
diff --git a/frontend/app/views/partials/admin/custom-field-dialog.html b/frontend/app/views/partials/admin/custom-field-dialog.html
index 9515566d64..3effb3a909 100644
--- a/frontend/app/views/partials/admin/custom-field-dialog.html
+++ b/frontend/app/views/partials/admin/custom-field-dialog.html
@@ -29,6 +29,7 @@ <h3 class="modal-title">{{$vm.customField.id ? 'Update' : 'Add'}} custom field</
                     ng-model="$vm.customField.name"
                     ng-keyup="$vm.clearUniqueNameError(fieldsForm)"
                     ng-pattern="$vm.config.namePattern"
+                    ng-readonly="!!$vm.customField.id"
                     required>
                 <p class="help-block" ng-show="fieldsForm.name.$error.unique">There is already a field with this name. It should be unique.</p>
                 <p class="help-block" ng-show="fieldsForm.name.$error.required && fieldsForm.name.$dirty">This field is required.</p>