WooCommerceCapture checks if WC exists before proceeding

src/WC/WooCommerceCapture.php

@@ -81,7 +81,8 @@ class WooCommerceCapture
      */
     public static function isSupportedWCVersion()
     {
-        return version_compare(\WooCommerce::instance()->version, self::SUPPORTED_WC_VERSION, '>=');
+        return class_exists(\WooCommerce::class) && version_compare(\WooCommerce::instance()->version,
+                self::SUPPORTED_WC_VERSION, '>=');
     }
 
     /**