Found this bug and just recreated on fresh install with demo products of Zen Cart v1.5.6c running PHP Version 7.2.20 (my host doesn't have 7.3 yet).
Every time you click the "Quantity Discounts Available" link and the "Option Quantity Discounts" window opens I get:
[07-Aug-2019 16:54:54 UTC] Request URI: /zen-cart-v1.5.6c/index.php?main_page=popup_attributes_qty_prices&products_id=159&products_tax_cla ss_id=1, IP address: **.***.***.***
#1 require(/home/server/public_html/zen-cart-v1.5.6c/includes/modules/pages/popup_attributes_qty_prices/header_php.php) called at [/home/server/public_html/zen-cart-v1.5.6c/index.php:36]
--> PHP Warning: Use of undefined constant NAVBAR_TITLE_1 - assumed 'NAVBAR_TITLE_1' (this will throw an Error in a future version of PHP) in /home/server/public_html/zen-cart-v1.5.6c/includes/modules/pages/popup_attributes_qty_prices/header_php.php on line 12.
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