[Namazu-users-en] Use of uninitialized value in concatenation (.) or str

I index from a shell script which calls mknmz. Interactively, it is OK
but, when ran from cron, it spits out a warning:

Use of uninitialized value in concatenation (.) or string at /usr/bin/mknmz 
line 250.
Looking for indexing files...
/home/stephane/Blog/RFC/2317.rfc_xml was updated!
5 files are found to be indexed.
...
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