diff --git a/system/Config/BaseService.php b/system/Config/BaseService.php
index 835145eee460..68f8c526fb41 100644
--- a/system/Config/BaseService.php
+++ b/system/Config/BaseService.php
@@ -192,7 +192,7 @@ protected static function getSharedInstance(string $key, ...$params)
             return static::$mocks[$key];
         }
 
-        if (! isset(static::$instances[$key])) {
+        if (! array_key_exists($key, static::$instances)) {
             // Make sure $getShared is false
             $params[] = false;