OJS upgrade OJS 3.1.2 to OJS 3.1.2.1, submission page HTTP error 500

@navmalik wrote:

I have recently upgraded my website from OJS 3.1.2 to OJS 3.1.2.1
Everything works fine except loading of submission tab shows error 500.
What should I do to rectify the issue?
Regards

Error Log details are:
[28-Jun-2019 03:57:37 UTC] PHP Fatal error: Uncaught Error: Call to a member function getFullName() on null in /home/zgz1shl6ysu9/public_html/ojs3121/lib/pkp/classes/submission/reviewAssignment/ReviewAssignmentDAO.inc.php:480
Stack trace:
#0 /home/zgz1shl6ysu9/public_html/ojs3121/lib/pkp/classes/submission/reviewAssignment/ReviewAssignmentDAO.inc.php(69): ReviewAssignmentDAO->_fromRow(Array)
#1 /home/zgz1shl6ysu9/public_html/ojs3121/lib/pkp/classes/submission/reviewAssignment/ReviewAssignmentDAO.inc.php(217): ReviewAssignmentDAO->_getReviewAssignmentsArray(‘SELECT r.*, r2…’, Array)
#2 /home/zgz1shl6ysu9/public_html/ojs3121/lib/pkp/classes/services/PKPSubmissionService.inc.php(308): ReviewAssignmentDAO->getBySubmissionId(‘1465’)
#3 /home/zgz1shl6ysu9/public_html/ojs3121/lib/pkp/classes/services/PKPSubmissionService.inc.php(341): PKP\Services\PKPSubmissionService->getReviewAssignments(Object(Article))
#4 /home/zgz1shl6ysu9/public_html/ojs3121/lib/pkp/classes/services/PKPSubmissionService.inc.php(601): PKP\Services\PKPSubmissionService->canUserViewAuth in /home/zgz1shl6ysu9/public_html/ojs3121/lib/pkp/classes/submission/reviewAssignment/ReviewAssignmentDAO.inc.php on line 480

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