Might want to confirm the version of your includes/functions/functions_prices.php file against a new or original 1.5.8 version. Line numbers are not aligning at least with:
https://github.com/zencart/zencart/b...ons_prices.php
Further I'm not yet seeing in that version of the file where an empty string would make its way back. I didn't do a comparison though between the v158 branch and the v1.5.8 breaks with also knowing that there was a sub version issued.
While I've found some other Zen Cart functions that don't handle a missing record sufficiently, this area may be one of them, but I don't really see how either tool could cause the described issue of the database field contains information on the correct format.
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