[WreckRman2]

I'm not sure what IF(value <> '', does however I got errors from it.

I also had to change $isbot_ipaddy to $isbot_ip

I then had to change $isbot_ip to '$isbot_ip' , otherwise it would return an error splitting up the IP address.
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So I ended up with this and it works fine... Thanks!

$db->query_write("UPDATE setting SET value = CONCAT(value, ' ', '$isbot_ip') WHERE varname ='banip'");