My cron job is sending this error on the email

Code:
<br />
<b>Warning</b>:  mysql_fetch_array(): supplied argument is not a valid MySQL result
resource in <b>/home/xhost/public_html/portal/remindtrial.php</b> on line
<b>19</b><br />
Trial reminders sent!

From the php code (gonna post just a part of it)


...