diff --git a/src/pocketmine/Server.php b/src/pocketmine/Server.php
index e8000a5fe..09084ddb1 100644
--- a/src/pocketmine/Server.php
+++ b/src/pocketmine/Server.php
@@ -799,6 +799,7 @@ class Server{
 	 * @return bool
 	 */
 	public function hasOfflinePlayerData(string $name) : bool{
+		$name = strtolower($name);
 		return file_exists($this->getDataPath() . "players/$name.dat");
 	}