diff --git a/CHANGELOG.md b/CHANGELOG.md
index 379d27d1..81e0612d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@
 **Merged pull requests:**
 
 - Release v2.1.5-2023.09 🎉
-- Minor improvements [\#235](https://github.com/torrentpier/torrentpier-lts/pull/235), [\#236](https://github.com/torrentpier/torrentpier-lts/pull/236), [\#237](https://github.com/torrentpier/torrentpier-lts/pull/237), [\#238](https://github.com/torrentpier/torrentpier-lts/pull/238), [\#239](https://github.com/torrentpier/torrentpier-lts/pull/239) ([belomaxorka](https://github.com/belomaxorka))
+- Minor improvements [\#235](https://github.com/torrentpier/torrentpier-lts/pull/235), [\#236](https://github.com/torrentpier/torrentpier-lts/pull/236), [\#237](https://github.com/torrentpier/torrentpier-lts/pull/237), [\#238](https://github.com/torrentpier/torrentpier-lts/pull/238), [\#239](https://github.com/torrentpier/torrentpier-lts/pull/239), [\#240](https://github.com/torrentpier/torrentpier-lts/pull/240) ([belomaxorka](https://github.com/belomaxorka))
 
 ## [v2.1.5-2023.08](https://github.com/torrentpier/torrentpier-lts/tree/v2.1.5-2023.08) (2023-09-04)
 [Full Changelog](https://github.com/torrentpier/torrentpier-lts/compare/v2.1.5-2023.07...v2.1.5-2023.08)
diff --git a/library/includes/functions.php b/library/includes/functions.php
index a3d7fc6c..225b7cd1 100644
--- a/library/includes/functions.php
+++ b/library/includes/functions.php
@@ -2821,7 +2821,7 @@ function bb_captcha ($mode, $callback = '')
 
 	$secret = $bb_cfg['captcha']['secret_key'];
 	$public = $bb_cfg['captcha']['public_key'];
-	$theme  = $bb_cfg['captcha']['theme'] ?? 'light';
+	$theme  = isset($bb_cfg['captcha']['theme']) ? $bb_cfg['captcha']['theme'] : 'light';
 
 	$reCaptcha = new ReCaptcha($secret);