Can't use an undefined value as an ARRAY reference in pt-table-checksum

[monty solomon]

% /usr/bin/pt-table-checksum --no-check-binlog-format --function murmur -h db.tools --recursion-method hosts
Can't use an undefined value as an ARRAY reference at /usr/bin/pt-table-checksum line 895.

% /usr/bin/pt-table-checksum --version
pt-table-checksum 2.2.15

With debug

# VersionCheck:892 13671 Version check failed: Argument "14\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0..." isn't numeric in subtraction (-) at /usr/bin/pt-table-checksum line 940.
#
Can't use an undefined value as an ARRAY reference at /usr/bin/pt-table-checksum line 895.

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PT-1308