Index: apachesolr/apachesolr_search.module
===================================================================
--- apachesolr/apachesolr_search.module	(revision 27870)
+++ apachesolr/apachesolr_search.module	(working copy)
@@ -867,7 +867,11 @@
  */
 function apachesolr_search_form_search_block_form_alter(&$form, $form_state) {
   if (variable_get('apachesolr_search_make_default', 0)) {
-    $form['#action'] = url('search/apachesolr_search');
+    $item = menu_get_item();
+    // Avoid double searches when already on a search page.
+    if ($item['path'] == 'search/apachesolr_search/%') {
+      $form['#action'] = url('search/apachesolr_search');
+    }
     if (!isset($form['#submit'])) {
       $form['#submit'] = array('apachesolr_search_search_box_form_submit');
     }