Objectionable content report throws errors on upgraded site

I upgraded a site from 18.04 to 18.10RC1 and when pulling up the objectionable content report, I get the following error messages. It works fine on a clean install.

To replicate:

1. Upgrade a site with some content to RC1 / master.
2. Report a page as objectionable.
3. View the objectionable material report.
Expected result: The table is shown.
Actual result: The following error messages.

[WAR] 79 (lib/errors.php:858) Failed to get a recordset: postgres8 error: [-1: ERROR: syntax error at end of input
LINE 11: ....reportedtime >= DATE( $1) AND obj.reportedtime <= DATE( $2)
                                                                        ^] in EXECUTE("SELECT COUNT(*) FROM (SELECT objectid AS viewid, report, NULL AS artefactid, reportedby, reportedtime, reviewedby, review, reviewedtime, resolvedtime, status
                      FROM "objectionable"
                      WHERE objecttype = 'view'
                      UNION
                      SELECT va.view AS viewid, o.report, o.objectid AS artefactid, reportedby, reportedtime, reviewedby, review, reviewedtime, resolvedtime, status
                      FROM "objectionable" o
                      JOIN "view_artefact" va ON va.artefact = o.objectid
                      WHERE o.objecttype = 'artefact'
                      ) AS obj
                JOIN "view" v ON v.id = obj.viewid
                JOIN "usr" u ON u.id = v.owner WHERE obj.resolvedtime IS NULL AND (u.id IN ('2') AND obj.reportedtime >= DATE(?) AND obj.reportedtime <= DATE(?)")Command was: SELECT COUNT(*) FROM (SELECT objectid AS viewid, report, NULL AS artefactid, reportedby, reportedtime, reviewedby, review, reviewedtime, resolvedtime, status
                      FROM "objectionable"
                      WHERE objecttype = 'view'
                      UNION
                      SELECT va.view AS viewid, o.report, o.objectid AS artefactid, reportedby, reportedtime, reviewedby, review, reviewedtime, resolvedtime, status
                      FROM "objectionable" o
                      JOIN "view_artefact" va ON va.artefact = o.objectid
                      WHERE o.objecttype = 'artefact'
                      ) AS obj
                JOIN "view" v ON v.id = obj.viewid
                JOIN "usr" u ON u.id = v.owner WHERE obj.resolvedtime IS NULL AND (u.id IN ('2') AND obj.reportedtime >= DATE(?) AND obj.reportedtime <= DATE(?) and values was (0:2014-09-07,1:2018-10-08)
Call stack (most recent first):

    log_message(string(size 2038), integer, true, true) at /home/kristina/code/1810stable/htdocs/lib/errors.php:95
    log_warn(string(size 2038)) at /home/kristina/code/1810stable/htdocs/lib/errors.php:858
    SQLException->__construct(string(size 2038)) at /home/kristina/code/1810stable/htdocs/lib/dml.php:517
    get_recordset_sql(string(size 867), array(size 2)) at /home/kristina/code/1810stable/htdocs/lib/dml.php:276
    count_records_sql(string(size 867), array(size 2)) at /home/kristina/code/1810stable/htdocs/lib/statistics.php:3222
    objectionable_stats_table(integer, integer, array(size 5), null, string(size 107)) at /home/kristina/code/1810stable/htdocs/lib/statistics.php:3176
    objectionable_statistics(integer, integer, array(size 5)) at /home/kristina/code/1810stable/htdocs/lib/statistics.php:4228
    display_statistics(string(size 3), string(size 7), object(stdClass)) at /home/kristina/code/1810stable/htdocs/admin/users/statistics.php:251

[WAR] 79 (lib/dml.php:517) Failed to get a recordset: postgres8 error: [-1: ERROR: syntax error at end of input
LINE 11: ....reportedtime >= DATE( $1) AND obj.reportedtime <= DATE( $2)
                                                                        ^] in EXECUTE("SELECT COUNT(*) FROM (SELECT objectid AS viewid, report, NULL AS artefactid, reportedby, reportedtime, reviewedby, review, reviewedtime, resolvedtime, status
                      FROM "objectionable"
                      WHERE objecttype = 'view'
                      UNION
                      SELECT va.view AS viewid, o.report, o.objectid AS artefactid, reportedby, reportedtime, reviewedby, review, reviewedtime, resolvedtime, status
                      FROM "objectionable" o
                      JOIN "view_artefact" va ON va.artefact = o.objectid
                      WHERE o.objecttype = 'artefact'
                      ) AS obj
                JOIN "view" v ON v.id = obj.viewid
                JOIN "usr" u ON u.id = v.owner WHERE obj.resolvedtime IS NULL AND (u.id IN ('2') AND obj.reportedtime >= DATE(?) AND obj.reportedtime <= DATE(?)")Command was: SELECT COUNT(*) FROM (SELECT objectid AS viewid, report, NULL AS artefactid, reportedby, reportedtime, reviewedby, review, reviewedtime, resolvedtime, status
                      FROM "objectionable"
                      WHERE objecttype = 'view'
                      UNION
                      SELECT va.view AS viewid, o.report, o.objectid AS artefactid, reportedby, reportedtime, reviewedby, review, reviewedtime, resolvedtime, status
                      FROM "objectionable" o
                      JOIN "view_artefact" va ON va.artefact = o.objectid
                      WHERE o.objecttype = 'artefact'
                      ) AS obj
                JOIN "view" v ON v.id = obj.viewid
                JOIN "usr" u ON u.id = v.owner WHERE obj.resolvedtime IS NULL AND (u.id IN ('2') AND obj.reportedtime >= DATE(?) AND obj.reportedtime <= DATE(?) and values was (0:2014-09-07,1:2018-10-08)
Call stack (most recent first):

    get_recordset_sql(string(size 867), array(size 2)) at /home/kristina/code/1810stable/htdocs/lib/dml.php:276
    count_records_sql(string(size 867), array(size 2)) at /home/kristina/code/1810stable/htdocs/lib/statistics.php:3222
    objectionable_stats_table(integer, integer, array(size 5), null, string(size 107)) at /home/kristina/code/1810stable/htdocs/lib/statistics.php:3176
    objectionable_statistics(integer, integer, array(size 5)) at /home/kristina/code/1810stable/htdocs/lib/statistics.php:4228
    display_statistics(string(size 3), string(size 7), object(stdClass)) at /home/kristina/code/1810stable/htdocs/admin/users/statistics.php:251