Error on docx and xlsx files in suitecrm 7.7.5

Hello,
When i uploaded a doc and xls file to suite crm it worked ok, without no problems,
but when i downloaded it again and tried to open it in MS word or MS Excel, i got an error.
Apache2 errorlog tells me that Undefined error 1 in download.php file on line 110
The file was corrupt.

But when i tried to open the same document on my Zorin OS linux, in libreoffice it worked fine, without any problem.

Do someone got a solution for this?