diff --git a/commerce_coupon.module b/commerce_coupon.module
index bc51e37..ce1e2ff 100644
--- a/commerce_coupon.module
+++ b/commerce_coupon.module
@@ -1142,7 +1142,10 @@ function commerce_coupon_commerce_coupon_discount_value_display_alter(&$text, $d
           break;
       }
 
-      $text = $offer_text . ' ' . t('off') . ' ' . $product_text;
+      // Account for if other modules have implemented custom product discount offer types
+      if (isset($offer_text)) {
+        $text = $offer_text . ' ' . t('off') . ' ' . $product_text;
+      }
 
       break;