--- titlesanchorlink/script.js~	2013-03-05 12:27:46.000000000 +0200
+++ titlesanchorlink/script.js	2015-09-28 16:36:26.690647453 +0300
@@ -1,6 +1,10 @@
 jQuery(function () {
 	jQuery(':header').each(function(){
 		var id = jQuery(this).attr('id');
+		if (!id) {
+			// https://github.com/Dric/dokuwiki-titlesanchorlink/issues/1
+			return;
+		}
 		var name = jQuery(this).text();
 		jQuery(this).append('<a title="Link to '+name+'" id="anchor__'+id+'" class="__anchor" href="#'+id+'"><img src="'+DOKU_BASE+'lib/plugins/titlesanchorlink/images/anchor.png" class="__anchor_icon" /></a>');
 	});