piwik import_logs.py error

I am getting following error message when i am importing logs to remote piwik any idea? my piwik version is 1.11.1, when i added --skip=1

./python2 /home/user1/import_logs.py --url=http://my.piwik.com/piwik --login=admin --password=123456 --skip=1 --idsite=1 /var/log/httpd/access_log
0 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
Parsing log /var/log/httpd/access_log...
79 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
79 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
79 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
79 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
Fatal error: <br />
<b>Fatal error</b>: Cannot use object of type stdClass as array in <b>/var/www/html/piwik/core/Common.php</b> on line <b>640</b><br />

You can restart the import of "/var/log/httpd/access_log" from the point it failed by specifying --skip=1 on the command line.