Not working

Info:

Stack trace:
#0 /home/fitstyle/public_html/wp-includes/class-wp-hook.php(288): custom_woocommerce_product_add_to_cart_text(‘Ver op\xC3\xA7\xC3\xB5es’)
#1 /home/fitstyle/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters(‘Ver op\xC3\xA7\xC3\xB5es’, Array)
#2 /home/fitstyle/public_html/wp-content/plugins/woocommerce/includes/class-wc-product-variable.php(60): apply_filters(‘woocommerce_pro…’, ‘Ver op\xC3\xA7\xC3\xB5es’, Object(WC_Product_Variable))
#3 /home/fitstyle/public_html/wp-content/plugins/ti-woocommerce-wishlist/public/wishlist/view.class.php(131): WC_Product_Variable->add_to_cart_text()
#4 /home/fitstyle/public_html/wp-includes/class-wp-hook.php(286): TInvWL_Public_Wishlist_View->variable_text(‘Adicionar ao Ca…’, Array, Object(WC_Product_Variable))
#5 /home/fitstyle/public_html/wp-includes/plugin.php(203): WP_Hoo in /home/fitstyle/public_html/wp-content/plugins/wc-custom-add-to-cart-labels/wc-custom-add-to-cart-labels.php on line 154
[28-Aug-2018 12:29:21 UTC] PHP Fatal error: Uncaught Error: Call to a member function get_type() on null in /home/fitstyle/public_html/wp-content/plugins/wc-custom-add-to-cart-labels/wc-custom-add-to-cart-labels.php:154
Stack trace:
#0 /home/fitstyle/public_html/wp-includes/class-wp-hook.php(288): custom_woocommerce_product_add_to_cart_text(‘Ver op\xC3\xA7\xC3\xB5es’)
#1 /home/fitstyle/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters(‘Ver op\xC3\xA7\xC3\xB5es’, Array)
#2 /home/fitstyle/public_html/wp-content/plugins/woocommerce/includes/class-wc-product-variable.php(60): apply_filters(‘woocommerce_pro…’, ‘Ver op\xC3\xA7\xC3\xB5es’, Object(WC_Product_Variable))
#3 /home/fitstyle/public_html/wp-content/plugins/ti-woocommerce-wishlist/public/wishlist/view.class.php(131): WC_Product_Variable->add_to_cart_text()
#4 /home/fitstyle/public_html/wp-includes/class-wp-hook.php(286): TInvWL_Public_Wishlist_View->variable_text(‘Adicionar ao Ca…’, Array, Object(WC_Product_Variable))
#5 /home/fitstyle/public_html/wp-includes/plugin.php(203): WP_Hoo in /home/fitstyle/public_html/wp-content/plugins/wc-custom-add-to-cart-labels/wc-custom-add-to-cart-labels.php on line 154