[PHP-DB] sql query

[CrossWalkCentral]

I am having a minor problem doing a simple sql query. 

Error performing service query : You have an error in your SQL syntax near '' at line 1

Here is a snip of the code: Please let me know what you think.

if ($submit):

$status="0";

// REQUEST INFO FOR SERVICES
$results = mysql_query(
"SELECT * FROM supportsyscat WHERE display=$custcatergory");
if (!$results) {       
echo("<P>Error performing service query : " .
mysql_error() . "</P>");
exit();
}

// Display the text
while ( $rows = mysql_fetch_array($results) ) {
$dservice=$rows["display"];
$eservice=$rows["address"];
}


$sql = "UPDATE supportsys SET " .
       "pdes='$custpdes', " .
       "sdes='$adminsdes', " .
       "status='$status' " .
       "WHERE ticket=$ticketnum";

if (mysql_query($sql)) {
    Echo("<center><P><h4>Ticket #$ticketnum has been updated.</h4></P></center>");
    Echo("Thank you $custfname $custlname");
    Echo("<p>Problem: $custpdes</P>");


if ($statusclose =="true") {
$status="Closed";
} else {
$status ="Open";
}