[phpesp-general] Export data to CSV: warning message messes up download

[Gary Ashton-J. <gas...@f2...>]

I get lots of lines like the following in my browser when I try to use 
the 'Export data to CSV' option. Any clues on how to remove it?

*Warning*: First argument to array_push() needs to be an array in 
*/usr/local/apache/htdocs/survey/phpESP14/admin/include/lib/espresponse.inc* 
on line *355

*TIA

Gary