ZC v 1.5.5b
upgraded from 1.39h a few months ago
Upgrade when smoothly
Apache Version 2.4.18
PHP Version 5.5.32
MySQL Version 5.6.34


After installing Pricelist I'm getting tons of my debug error logs with the following..(paths altered to protect the innocent)

[17-Nov-2016 15:34:58 UTC] Request URI: /store/index.php?language=en&main_page=pricelist&zenid=o4gkinvm213nuoq4k1eqmu0dg7, IP address: 192.243.55.132
#1 constant() called at [/home/public_html/store/includes/modules/pages/pricelist/header_php.php:91]
#2 price_list->__construct() called at [/home/public_html/store/includes/modules/pages/pricelist/header_php.php:318]
#3 require(/home/public_html/store/includes/modules/pages/pricelist/header_php.php) called at [/home/public_html/store/index.php:36]

[17-Nov-2016 15:34:58 UTC] PHP Warning: constant(): Couldn't find constant PL_SHOW_SPECIAL_DATE_3 in /home/public_html/store/includes/modules/pages/pricelist/header_php.php on line 91

I'm going to try commenting the line containing PL_SHOW_SPECIAL_DATE in header_php.php and see if that at least stops the debug logs.

any other advise is welcome.