Error message

• Notice: Trying to access array offset on value of type null in template_preprocess_dc_ajax_shopping_cart_teaser() (line 612 of /home/ancienci/public_html/sites/all/modules/dc_ajax_add_cart/dc_ajax_add_cart.module).
• Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in require_once() (line 341 of /home/ancienci/public_html/includes/module.inc).