diff --git a/CHANGELOG b/CHANGELOG
index 5ed1bf794d..b3a675541c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -5,6 +5,7 @@ Version 1.1.28 under development
 --------------------------------
 
 - Bug #4491: Fixed limit and Offset not working correctly with MSSQL version 11 (2012) and newer (shnoulle, wtommyw)
+- Bug #4497: PHP 8.1 compatibility: Fix unserialize null in CRedisCache (kenguest, wtommyw)
 - Bug #4500: PHP 8.1 compatibility: Fix deprecation warnings in CMysql classes (csears123)
 
 Version 1.1.27 November 21, 2022
diff --git a/framework/caching/CRedisCache.php b/framework/caching/CRedisCache.php
index e9770564df..15d4488ac6 100644
--- a/framework/caching/CRedisCache.php
+++ b/framework/caching/CRedisCache.php
@@ -204,7 +204,10 @@ private function byteLength($str)
 	 */
 	protected function getValue($key)
 	{
-		return $this->executeCommand('GET',array($key));
+		$value=$this->executeCommand('GET',array($key));
+		if ($value===null)
+			return false;
+		return $value;
 	}
 
 	/**