Exception on cron job

[aanunez]

A user reached out via email with the below issue reported by their redcap system. They are currently attempting to reproduce the issue in a minimal viable project. I was unable to do so.

User's system: REDCap 13.4.13 · PHP 8.1.19 (Linux/Unix OS) · MySQL 5.7.33 on 15/05/2023 Unable to replace issue using XML in REDCap 13.7.1 · PHP 8.1.19 (Linux/Unix OS) · MySQL 8.0.33

Cron job 'recalculate_user' failed for External Module 'recalculate'.

Exception: Error: Cannot unset offset in a non-array variable in /var/www/html/redcap_v13.4.13/Classes/DataQuality.php:4678
Stack trace:
#0 /var/www/html/redcap_v13.4.13/Classes/Records.php(6898): DataQuality::dataResolutionAutoDeverify()
#1 /var/www/html/redcap_v13.4.13/Classes/Calculate.php(552): Records::saveData()
#2 /var/www/html/modules/recalculate_v1.3.7/Recalculate.php(316): Calculate::saveCalcFields()
#3 /var/www/html/modules/recalculate_v1.3.7/Recalculate.php(125): UWMadison\Recalculate\Recalculate->recalculate()
#4 /var/www/html/redcap_v13.4.13/ExternalModules/classes/ExternalModules.php(6328): UWMadison\Recalculate\Recalculate->run_cron()
#5 /var/www/html/redcap_v13.4.13/Classes/Cron.php(332): ExternalModules\ExternalModules::callCronMethod()
#6 /var/www/html/redcap_v13.4.13/cron.php(23): Cron->execute()
#7 /var/www/html/cron.php(9): include('...')
#8 {main}

[aanunez]

This issue has not come up again and has now occurred on an out of date version of redcap. Closing.

If this does occur again it is related to $data being empty (possibly?) while using the data resolution workflow.