Problem with mk-show-grants

I am getting the following error …

Use of uninitialized value in split at ./mk-show-grants line 1731

mk-show-grants Ver 1.0.23 Distrib 7207 Changeset 7105

Any suggestions on how to work around this ?

All of the Maatkit tools honor an environment variable called MKDEBUG. Set that and run the tool again to see verbose debugging output, which might provide a clue as to what is wrong:

MKDEBUG=1 mk-show-grants …