1 files changed, 3 insertions, 1 deletions
diff --git a/lib/scripts/page.js b/lib/scripts/page.js
index baacee238..0bb75b961 100644
--- a/lib/scripts/page.js
+++ b/lib/scripts/page.js
@@ -26,7 +26,9 @@ dw_page = {
              */
             .each(function () {
                 let $tgt = jQuery(this).parent();
-                const nr = $tgt.attr('class').match(/(\s+|^)editbutton_(\d+)(\s+|$)/)[2];
+                const match = $tgt.attr('class').match(/(\s+|^)editbutton_(\d+)(\s+|$)/);
+                if(!match) return;
+                const nr = match[2];
                 let $highlight = jQuery(); // holder for elements in the section to be highlighted
                 const $highlightWrap = jQuery('<div class="section_highlight_wrapper"></div>');