[Resolved] mysql_num_rows(): not valid MySQL result resource

[leatherback]

Hi,

This is a snippet of a code which throws the error

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in c:\phpdev\www\public\management\testsearch.php on line 48

I don't know why though. There is a value in $value, and the query runs in phpadmin. What am I missing?

foreach($keywords as $key=> $value)
  {
  echo $value;
    $intable = mysql_query("select * from st_keyword where description = $value");
     if ( mysql_num_rows($intable) == 0)
       {
       $inserted = mysql_query("insert into st_keyword ( description, refer_id, count) 
                                               values ('$key', '$refererid', '1'");
       }

Thanks..?