diff -drup a/contrib/search_api_views/includes/handler_filter_options.inc b/contrib/search_api_views/includes/handler_filter_options.inc
--- a/contrib/search_api_views/includes/handler_filter_options.inc	Wed Jan  9 10:04:04 2013
+++ b/contrib/search_api_views/includes/handler_filter_options.inc	Wed Jan 30 15:42:46 2013
@@ -99,7 +99,7 @@ class SearchApiViewsHandlerFilterOptions
       '#options' => $options,
       '#multiple' => TRUE,
       '#size' => min(4, count($this->definition['options'])),
-      '#default_value' => isset($this->value) ? $this->value : array(),
+      '#default_value' => is_array($this->value) ? $this->value : array(),
     );
 
     // Hide the value box if operator is 'empty' or 'not empty'.