Master CDR file (Master.csv) is all of a sudden blank

My Master CDR file (Master.csv) is all of a sudden blank (has no data in it and no new data is being written to it). Not sure what to do or how to get the data back.

It is the one found in:

/var/log/asterisk/cdr-csv

mine is blank too… I think the CDR reports in freepbx distro are looking at mysql. The Master.csv files were used for the old Digium distro.

Mine was working fine for abour 2 months then all of a sudden stopped.