diff --git a/src/CcvOnlinePaymentsApi.php b/src/CcvOnlinePaymentsApi.php
index 5ef42f4..20d917c 100644
--- a/src/CcvOnlinePaymentsApi.php
+++ b/src/CcvOnlinePaymentsApi.php
@@ -141,7 +141,7 @@ public static function getSortedMethodIds($countryCode = null) {
             "banktransfer"
         ];
 
-        if(strtoupper($countryCode) === "BE") {
+        if(strtoupper($countryCode ?? "") === "BE") {
             $methodIds[0] = "card_bcmc";
             $methodIds[1] = "ideal";
         }