Error XLSXReader when import - by: fran_collombon

Hi, i have this log when i want to import a xlsx file :

2016-05-09 16:46:11.428 ===== TRACE ===== Importation : File type XSLX
2016-05-09 16:46:11.428 ===== TRACE ===== File Name : ../files/import/Work_09_05_2016_14_45_22_59.xlsx
2016-05-09 16:46:11.433 ***** ERROR ***** ERROR *****
2016-05-09 16:46:11.433 ***** ERROR ***** on file '/var/www/projeqtor/external/XLSXReader/XLSXReader.php' at line (200)
2016-05-09 16:46:11.433 ***** ERROR ***** cause = Undefined offset: 1
2016-05-09 16:46:11.433 ===== TRACE ===== Import ERROR : file Work_09_05_2016_14_45_22_59.xlsx imported with 0 errors [ Number of 'Work' imported : 0 ]

And my fie is attach.

Can you help me? I use the last version : V5.3.3!