diff --git a/src/Logger.php b/src/Logger.php
index f1dcd9f..aa4114c 100644
--- a/src/Logger.php
+++ b/src/Logger.php
@@ -83,9 +83,10 @@ protected function getCredentials()
             'version' => $cloudWatchConfigs['version'],
         ];
 
-        if ($cloudWatchConfigs['credentials']['key']) {
-            $awsCredentials['credentials'] = $cloudWatchConfigs['credentials'];
+        if (!isset($cloudWatchConfigs['credentials'])) {
+            throw new IncompleteCloudWatchConfig('Missing credentials');
         }
+        $awsCredentials['credentials'] = $cloudWatchConfigs['credentials'];
 
         return $awsCredentials;
     }