Issue with empty product tags field

[systechabc]

Hello,

I'm using Magmi v0.7.20_git, with Magento ver. 1.9.2.1.

I have an issue with product tags in the feed. If that field is filled, everything is ok, but if it's empty, the import crashes with a weird description:
SQLSTATE[HY093]: Invalid parameter number: no parameters were bound

This happens with each product that has no tags. The only way i found to get around this is if I provide "MAGMI_IGNORE" value to each product which does not have any tags.

Can anyone tell me why is this happening and what could I do to fix it?
Thanks in advance,