found some warning on maillog

[Watthanachai Kekhua]

Dear Amavis team,

                Today we found some warning  below ,

amavis[67002]: (67002-03-2) _WARN: Argument "undef" isn't numeric in addition (+) at (eval 123) line 307.

My amavisd version = amavisd-new-2.7.0
OS = FreeBSD 8.2 amd 64 bit

We try to see this error on google but could not found any information ,
could you try to help us for this error ?

Thank you very much, we still looking for your answer .

Please do not hesitate to contact us , If you have any questions .
Best Regards.
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