ZC 1.5.7, PHP 7.3 - Logged out of admin when viewing session data

[mc12345678]

After installation of Version 1.5.9 to ZC 1.5.7b, when attempting to "view" the user tracking history of a session, had a myDEBUG-adm file generated and was logged out of the admin:

[DATE TIME TIMEZONE] Request URI: /admin/index.php?cmd=user_tracking, IP address: IP_ADDRESS
#1  session_decode() called at [/PATH_TO_STORE/admin/user_tracking.php:778]
#2  require(/PATH_TO_STORE/admin/user_tracking.php) called at [/PATH_TO_STORE/admin/index.php:11]
--> PHP Warning: session_decode(): Failed to decode session object. Session has been destroyed in /PATH_TO_STORE/admin/user_tracking.php on line 778.

[DATE TIME TIMEZONE] Request URI: /admin/index.php?cmd=user_tracking, IP address: IP_ADDRESS
#1  session_decode() called at [/PATH_TO_STORE/admin/user_tracking.php:787]
#2  require(/PATH_TO_STORE/admin/user_tracking.php) called at [/PATH_TO_STORE/admin/index.php:11]
--> PHP Warning: session_decode(): Session is not active. You cannot decode session data in /PATH_TO_STORE/admin/user_tracking.php on line 787.

The code of the Zen Cart's who's online is able to provide the desired information without this issue. The hint may be in the associated class file that may also allow stepping away from individual code within the plugin and depend even more on ZC's code.

[mc12345678]

Fixed primarily in: 182f0ec

To be released as part of version 1.5.10 upon update of other information to support distribution to Zen Cart forum.