CiviCRM 5.51 and nz.co.fuzion.csvimport - When attempting to import Contacts to multiple Groups matching on Contact External ID fails with PHP Fatal error

[agileware-justin]

CiviCRM 5.51 and nz.co.fuzion.csvimport - When attempting to import Contacts to multiple Groups matching on Contact External ID fails with PHP Fatal error.

CSV format is as follows:

Group Title	Contact External ID
Group A	Contact-001
Group B	Contact-001
Group C	Contact-001
Group D	Contact-001
Group A	Contact-002
Group B	Contact-002
Group C	Contact-002
Group D	Contact-002
Group A	Contact-003
Group B	Contact-003
Group C	Contact-003
Group D	Contact-003

Error logged:

[Fri Aug 05 17:28:48.922213 2022] [proxy_fcgi:error] [pid 796715:tid 140481031812864] [client 49.255.138.190:0] AH01071: Got error 'PHP message: PHP Warning:  Invalid argument supplied for foreach() in /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/
Import/Parser.php on line 1876PHP message: PHP Warning:  Invalid argument supplied for foreach() in /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Import/Parser.php on line 1876PHP message: PHP Warning:  Invalid
argument supplied for foreach() in /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Import/Parser.php
...
h() in /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Import/Parser.php on line 1876 PHP message: PHP Warning:  Invalid argument supplied for foreach() in /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Import/Parser.php on line 1876 PHP message: PHP Warning:  Invalid argument supplied for foreach() in /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Import/Parser.php on line 1876', referer: https://still-raining.com.au/wp-admin/admin.php?page=CiviCRM&q=civicrm%2Fcsvimporter%2Fimport&_qf_MapField_display=true&qfKey=CRMCsvimportImportController5yraj0cf3q4g4cc44skg0g4s00wokkoo40og0cscwckoo4w0ws_7597
[Fri Aug 05 17:29:04.392401 2022] [proxy_fcgi:error] [pid 796934:tid 140481082136320] [client 49.255.138.190:0] AH01071: Got error 'PHP message: PHP Fatal error:  UncaughtTypeError: Return value of CRM_Import_Parser::getFieldMetadata() must be of the type array, null returned in /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Import/Parser.php:1504\nStack trace:\n#0 /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Import/Parser.php(1857): CRM_Import_Parser->getFieldMetadata()\n#1 /var/www/htdocs/wp-content/plugins/civicrm/civicrm/ext/nz.co.fuzion.csvimport/CRM/Csvimport/Import/Parser/Api.php(85): CRM_Import_Parser->getMappedRow()\n#2 /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Import/Parser.php(1917): CRM_Csvimport_Import_Parser_Api->import()\n#3 /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Queue/Task.php(95): CRM_Import_Parser::runJob()\n#4 /var/www/htdocs/wp-content/plugins/civicrm/civicrm/CRM/Queue/Runner.php(257): CRM_Queue_Task->run()\n#5 /var/www/htdocs/wp-content/plugins/civic...', referer: https://still-raining.com.au/wp-admin/admin.php?page=CiviCRM&q=civicrm%2Fqueue%2Frunner&reset=1&qrid=user_job_71

Agileware Ref: CIVICRM-2027