diff --git a/public/src/client/topic.js b/public/src/client/topic.js
index dc311d1c38..b4dd497dc3 100644
--- a/public/src/client/topic.js
+++ b/public/src/client/topic.js
@@ -224,7 +224,7 @@ define('forum/topic', [
 				btn.find('i').removeClass('fa-copy').addClass('fa-check');
 				setTimeout(() => btn.find('i').removeClass('fa-check').addClass('fa-copy'), 2000);
 				const codeEl = btn.parent().find('code');
-				if (codeEl.attr('data-lines')) {
+				if (codeEl.attr('data-lines') && codeEl.find('.hljs-ln-code[data-line-number]').length) {
 					return codeEl.find('.hljs-ln-code[data-line-number]')
 						.map((i, e) => e.textContent).get().join('\n');
 				}