diff --git a/includes/view.inc b/includes/view.inc
index d082a0b..02ac377 100644
--- a/includes/view.inc
+++ b/includes/view.inc
@@ -422,6 +422,13 @@ class view extends views_db_object {
         }
       }
 
+      // For some reason, if the sort_by is empty, we receive the following
+      // message: 'An illegal choice has been detected. Please contact the site administrator'.
+      // We unset the sort by when it's empty.
+      if (isset($this->exposed_input['sort_by']) && empty($this->exposed_input['sort_by'])) {
+        unset($this->exposed_input['sort_by']);
+      }
+
       // If we have no input at all, check for remembered input via session.
 
       // If filters are not overridden, store the 'remember' settings on the