Description:
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From manual page: http://www.php.net/mysqli.multi-query
---
If you put in multi_query() 3 SQL sentences for example: Valid1; Non-valid2; Valid3; only you get results of the first SQl sentence.

¿Is a bug or its my conceptual error?

Test script:
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$query  = 'Valid SQL sentence;';
$query .= 'NON valid SQL sentence;';    //For example: Incorrect table.
$query .= 'Valid SQL sentence;';

$mysqli->multi_query($query);

$mysqli->next_result();             //Returns TRUE, ok (valid SQL sentence)
$result = $mysqli->store_result();
$row = $result->fetch_assoc();
var_dump($row[0]);

$mysqli->next_result();             //Returns FALSE, Ok (non valid SQL sentence)

$mysqli->next_result();             //Returns FALSE, but is a valid SQL sentence
$result = $mysqli->store_result();
$row = $result->fetch_assoc();
var_dump($row[0]);

Expected result:
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In the second evaluation $mysqli->next_result() returns FALSE because is a non-valid SQL sentece is OK, but if you try to get the results of the next valid SQL sentence you can't, if you try to evaluate again retuns FALSE again.