diff -u b/handlers/views_handler_filter_in_operator.inc b/handlers/views_handler_filter_in_operator.inc
--- b/handlers/views_handler_filter_in_operator.inc
+++ b/handlers/views_handler_filter_in_operator.inc
@@ -359,7 +359,7 @@
   }
 
   function op_simple() {
-    if (!is_array($this->value)) {
+    if (empty($this->value) || !is_array($this->value)) {
       return;
     }
     $this->ensure_my_table();