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    Coding error detected, it must be fixed by a programmer: count_records_sql() expects the first field to contain non-negative number from COUNT(), '' found instead.

    More information about this error

    Debug info:
    Error code: codingerror
    Stack trace:
    • line 1872 of /lib/dml/moodle_database.php: coding_exception thrown
    • line 169 of /blocks/iomad_commerce/shop.php: call to moodle_database->count_records_sql()