Seeing hundreds of warnings running statistics

[universityofglasgow]

Moodle 4.1.6
Plugin version: 2023-09-29 (10)

Running statistics we get hundreds of warnings. They just repeat for (presumably) different attempts, so here are some examples.

Warning: Attempt to read property "answerformat" on null in /var/www/html/moodle40/question/type/ordering/question.php on line 298
Unexpected sub-part id encountered.
line 133 of /question/classes/statistics/responses/analysis_for_question.php: call to debugging()
line 194 of /question/classes/statistics/responses/analysis_for_question.php: call to core_question\statistics\responses\analysis_for_question->get_analysis_for_subpart()
line 134 of /question/classes/statistics/responses/analyser.php: call to core_question\statistics\responses\analysis_for_question->count_response_parts()
line 803 of /mod/quiz/report/statistics/report.php: call to core_question\statistics\responses\analyser->calculate()
line 772 of /mod/quiz/report/statistics/report.php: call to quiz_statistics_report->analyse_responses_for_questions()
line 721 of /mod/quiz/report/statistics/report.php: call to quiz_statistics_report->analyse_responses_for_all_questions_and_subquestions()
line 159 of /mod/quiz/report/statistics/report.php: call to quiz_statistics_report->get_all_stats_and_analysis()
line 97 of /mod/quiz/report.php: call to quiz_statistics_report->display()
Unexpected class id 1 encountered.
line 87 of /question/classes/statistics/responses/analysis_for_subpart.php: call to debugging()
line 110 of /question/classes/statistics/responses/analysis_for_subpart.php: call to core_question\statistics\responses\analysis_for_subpart->get_response_class()
line 194 of /question/classes/statistics/responses/analysis_for_question.php: call to core_question\statistics\responses\analysis_for_subpart->count_response()
line 134 of /question/classes/statistics/responses/analyser.php: call to core_question\statistics\responses\analysis_for_question->count_response_parts()
line 803 of /mod/quiz/report/statistics/report.php: call to core_question\statistics\responses\analyser->calculate()
line 772 of /mod/quiz/report/statistics/report.php: call to quiz_statistics_report->analyse_responses_for_questions()
line 721 of /mod/quiz/report/statistics/report.php: call to quiz_statistics_report->analyse_responses_for_all_questions_and_subquestions()
line 159 of /mod/quiz/report/statistics/report.php: call to quiz_statistics_report->get_all_stats_and_analysis()
line 97 of /mod/quiz/report.php: call to quiz_statistics_report->display()

Warning: Undefined array key 11163912 in /var/www/html/moodle40/question/type/ordering/question.php on line 297

Warning: Attempt to read property "answer" on null in /var/www/html/moodle40/question/type/ordering/question.php on line 298

Warning: Attempt to read property "answerformat" on null in /var/www/html/moodle40/question/type/ordering/question.php on line 298