diff --git a/handlers/views_handler_filter.inc b/handlers/views_handler_filter.inc
index 9615c3058f98f89243f50f15036824b648c18851..d685cfd7923857a94d943225980918dad4c3471a 100644
--- a/handlers/views_handler_filter.inc
+++ b/handlers/views_handler_filter.inc
@@ -1392,7 +1392,9 @@ class views_handler_filter extends views_handler {
         $session[$this->options['expose']['operator_id']] = $input[$this->options['expose']['operator_id']];
       }
 
-      $session[$this->options['expose']['identifier']] = $input[$this->options['expose']['identifier']];
+      if (isset($input[$this->options['expose']['identifier']])) {
+        $session[$this->options['expose']['identifier']] = $input[$this->options['expose']['identifier']];
+      }
     }
   }