Cannot use a scalar value as an array

[BigPeter]

[10]  $sql = "SELECT COUNT(DISTINCT tourid) FROM teams";  
[11]  $dbconn = mysqli_connect($hostname, $username, $password, $database);  
[12]  $stmt = mysqli_prepare($dbconn, $sql);  
[13]  mysqli_stmt_execute($stmt);  
[14]  mysqli_stmt_bind_result($stmt, $ctourneys);  
[15]  mysqli_stmt_fetch($stmt);

Warning: Cannot use a scalar value as an array in xxx on line 13
Warning: Cannot use a scalar value as an array in xxx on line 13
Warning: Cannot use a scalar value as an array in xxx on line 13
Warning: Cannot use a scalar value as an array in xxx on line 13
Warning: Cannot use a scalar value as an array in xxx on line 13

Ich kriege die Errormeldung direkt 5mal und habe keinen blassen Schimmer was ich falsch mache. Mein COUNT(DISTINCT tourid) gibt doch lediglich EIN Value aus richtig ? Warum also array ?

Liebe Grüße

BIG PETER