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-rw-r--r--public/js/extra.js6
1 files changed, 4 insertions, 2 deletions
diff --git a/public/js/extra.js b/public/js/extra.js
index ed1470be..76e95635 100644
--- a/public/js/extra.js
+++ b/public/js/extra.js
@@ -846,11 +846,13 @@ const linkifyAnchors = (level, containingElement) => {
let header = headers[i]
if (header.getElementsByClassName('anchor').length === 0) {
if (typeof header.id === 'undefined' || header.id === '') {
- // to escape characters not allow in css and humanize
+ // to escape characters not allow in css and humanize
const id = slugifyWithUTF8(getHeaderContent(header))
header.id = id
}
- header.insertBefore(anchorForId(header.id), header.firstChild)
+ if (!(typeof header.id === 'undefined' || header.id === '')) {
+ header.insertBefore(anchorForId(header.id), header.firstChild)
+ }
}
}
}