fix: shipping debug triggers Fatel Error

related: #54

src/QUI/ERP/Shipping/Debug.php

@@ -116,6 +116,10 @@ public static function generateShippingEntryDebuggingLog(
         $result,
         $debuggingLog
     ) {
+        if (defined('QUIQQER_AJAX')) {
+            return;
+        }
+
         if (self::isRuleAlreadyDebugged($Entry->getId())) {
             return;
         }

src/QUI/ERP/Shipping/Order/Shipping.php

@@ -67,7 +67,7 @@ public function getBody()
         $shippingList = $this->getValidShipping();
 
         // debugging logger
-        if (QUI\ERP\Shipping\Shipping::getInstance()->debuggingEnabled()) {
+        if (QUI\ERP\Shipping\Shipping::getInstance()->debuggingEnabled() && !defined('QUIQQER_AJAX')) {
             QUI\ERP\Shipping\Debug::clearLogStock();
 
             $debugStack = [];

src/QUI/ERP/Shipping/Types/ShippingEntry.php

@@ -724,7 +724,7 @@ public function getShippingRules(): array
         }
 
         // debug shipping entry / rules
-        if ($debugging) {
+        if ($debugging && !defined('QUIQQER_AJAX')) {
             QUI\ERP\Shipping\Debug::enable();
             QUI\ERP\Shipping\Debug::generateShippingEntryDebuggingLog($this, $result, $debuggingLog);
             QUI\ERP\Shipping\Debug::disable();