diff --git a/public/src/client/topic.js b/public/src/client/topic.js
index da5ecae1b0..77b4ad9aa6 100644
--- a/public/src/client/topic.js
+++ b/public/src/client/topic.js
@@ -371,7 +371,7 @@ define('forum/topic', [
 	}
 
 	function setupQuickReply() {
-		if (config.enableQuickReply || config.theme.enableQuickReply) {
+		if (config.enableQuickReply || (config.theme && config.theme.enableQuickReply)) {
 			quickreply.init();
 		}
 	}