diff --git a/ext/rss_images/main.php b/ext/rss_images/main.php
index cc4e0213..1e14e9b7 100644
--- a/ext/rss_images/main.php
+++ b/ext/rss_images/main.php
@@ -31,7 +31,7 @@ class RSSImages extends Extension
                 $images = Image::find_images(($page_number-1)*$page_size, $page_size, $search_terms);
                 $this->do_rss($images, $search_terms, $page_number);
             } catch (SearchTermParseException $stpe) {
-                $this->theme->display_error(400, "Search parse error", $pde->error);
+                $this->theme->display_error(400, "Search parse error", $stpe->error);
             } catch (PermissionDeniedException $pde) {
                 $this->theme->display_error(403, "Permission denied", $pde->error);
             }