Hi, I found the same issue exporting results.
When exporting to CSV, Excel, PDF or HTML I get an ]Internal Server Error
> Call to a member function getColumnNames() on null (error.png attached)
When exporting to MS Word,
> I get the same error as the content of the .doc file
Finally -what might be related to this issue- I found that in the Columns selection, the only columns that appear are the time trackers (columnas.png attached) .
And if the time tracking option is not selected, then no Columns are shown to be selected in the Expert Result page.
LS Versión is 3.0.0+171222, and I try using PHP 5.6 and 7.0 -both with same results.