diff --git a/commerce_stripe.module b/commerce_stripe.module
index a1a7806..c1fae62 100755
--- a/commerce_stripe.module
+++ b/commerce_stripe.module
@@ -1508,7 +1508,9 @@ function commerce_stripe_commerce_stripe_metadata($order) {
 // Helper function to set the API key.
 // @todo: Use with a global config we can programmatically change (via Rules etc.)
 function _commerce_stripe_set_api_key($payment_method) {
-  Stripe\Stripe::setApiKey(trim($payment_method['settings']['secret_key']));
+  if (!empty($payment_method['settings']['secret_key'])) {
+    Stripe\Stripe::setApiKey(trim($payment_method['settings']['secret_key']));
+  }
 }
 
 /**