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I have a module which extends Magento API (SOAP). I make the call using an external file and everything is fine. When the same call comes from another system (the extension for API is for a mobile app) then I get

SQLSTATE[21000]: Cardinality violation: 1241 Operand should contain 1 column(s)

and I don't have any idea what the problem is. This is how I call my method:

$result = $client->call($session_id, 'customer.login', array(
    'website'   => 'base',
    'email'     => 'denisa@yahoo.com',
    'password'  => '123456'
));

Can someone tell what should I verify?

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On the server side, enable sql logging (ideally only your API call should run against that server, in order to debug):

In Varien_Db_Adapter_Pdo_Mysql

lib/varien/Db/Adapter/Pdo/Mysql.php

set

protected $_debug               = true;
protected $_logAllQueries       = true;

and (if nor already there) create the folder defined in

protected $_debugFile           = 'var/debug/sql.txt';

Run the API call then have a look at the log file and see what queries ran and why it gives an error.

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