Fatal error: Uncaught Error

Dear Dynamic Pricing,

After putting items in the cart with the pricing role (on mobile) I get the following error:
Fatal error: Uncaught Error: Call to a member function get_id() on null in /home/customer/www/miausa.ae/public_html/wp-content/plugins/advanced-dynamic-pricing-for-woocommerce/BaseVersion/Includes/Cart/FreeCartItemChoicesSuitability.php:63 Stack trace: #0 /home/customer/www/miausa.ae/public_html/wp-content/plugins/advanced-dynamic-pricing-for-woocommerce/BaseVersion/Includes/Rule/GiftStrategy.php(417): ADP\BaseVersion\Includes\Cart\FreeCartItemChoicesSuitability->getProductsSuitableToGift(Object(ADP\BaseVersion\Includes\Cart\Structures\FreeCartItemChoices), Object(ADP\BaseVersion\Includes\Rule\ProductStock\ProductStockController), 0) #1 /home/customer/www/miausa.ae/public_html/wp-content/plugins/advanced-dynamic-pricing-for-woocommerce/BaseVersion/Includes/Rule/GiftStrategy.php(311): ADP\BaseVersion\Includes\Rule\GiftStrategy->processFreeItem(Array, 'cca8d4418e48695...', Object(ADP\BaseVersion\Includes\Cart\Structures\Cart), Object(ADP\BaseVersion\Includes\Cart\Structures\FreeCartItemChoices)) #2 /home/customer/www/miausa in /home/customer/www/miausa.ae/public_html/wp-content/plugins/advanced-dynamic-pricing-for-woocommerce/BaseVersion/Includes/Cart/FreeCartItemChoicesSuitability.php on line 63

Can you help me on that?

Thanks
tanlaci