when rewriting, require //source elements to have @src

1 files changed, 1 insertions, 1 deletions

diff --git a/init.php b/init.php
index cea2d58..c6edf05 100644
--- a/init.php
+++ b/init.php
@@ -237,7 +237,7 @@ class Af_Zz_Api_Resize extends Plugin {
 				}
 			}
 
-			$psrcs = $xpath->query("//picture/source");
+			$psrcs = $xpath->query("//picture/source[@src]");
 
 			foreach ($psrcs as $src) {
 				$new_src = $this->rewrite_url_if_needed($src->getAttribute("src"), $width);