getThumbnail() may legitimately return null

diff --git a/includes/Linker.php b/includes/Linker.php
index fbecbd9..7b4b611 100644 (file)
--- a/includes/Linker.php
+++ b/includes/Linker.php
@@ -420,8 +420,10 @@ class Linker {
                        }
                        if ( '' == $manual_thumb ) {
                                $thumb = $img->getThumbnail( $width );
-                               $height = $thumb->height;
-                               $url = $thumb->getUrl( );
+                               if ( $thumb ) {
+                                       $height = $thumb->height;
+                                       $url = $thumb->getUrl( );
+                               }
                        }
                }