php - Prepared Statement Inner Join Cannot Pass Parameter by Reference -

i've been trying figure out while , i've searched similar problems, can't find solution.

i'm working on game setup application , i'm having issue prepared statement.

if ($stmt = $connection->prepare("select pack.id, count(race.name)                                    pack                                       inner join race on pack.id = race.pack                                    pack.id = ?                                    group race.pack")) {      $stmt->bind_param("s", $_session["id"]);     $stmt->execute();     $stmt->bind_result($rsltid, rsltraces);      while ($stmt->fetch()) {         $racespack[$rsltid] = $rsltraces;     }      $stmt->close(); } 

this returns error: "fatal error: cannot pass parameter 2 reference".

any help/advice appreciated!

your $stmt->bind_result($rsltid, rsltraces); wrong. should $stmt->bind_result($rsltid, $rsltraces);