diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5351c7976..be56a9439 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ Yii Framework 2 redis extension Change Log
 2.0.20 under development
 ------------------------
 
-- no changes in this release.
+- Bug #270: Prevent null parameter on `mb_strlen` to avoid PHP 8.4 implicity nullable types deprecation (tehmaestro)
 
 
 2.0.19 February 13, 2025
diff --git a/src/Connection.php b/src/Connection.php
index b9772ff25..3d35fd200 100644
--- a/src/Connection.php
+++ b/src/Connection.php
@@ -766,7 +766,7 @@ public function executeCommand($name, $params = [])
         $params = array_merge(explode(' ', $name), $params);
         $command = '*' . count($params) . "\r\n";
         foreach ($params as $arg) {
-            $command .= '$' . mb_strlen($arg, '8bit') . "\r\n" . $arg . "\r\n";
+            $command .= '$' . mb_strlen($arg ?? '', '8bit') . "\r\n" . $arg . "\r\n";
         }
 
         \Yii::trace("Executing Redis Command: {$name}", __METHOD__);