Array to string conversion error when exporting submisssion

[binarykitchen]

Seeing this error in the generated CSV file

<br />
<b>Notice</b>:  Array to string conversion in <b>/home/michael-heuberger/code/test/public/wp-content/plugins/ninja-forms/includes/Database/Models/Submission.php</b> on line <b>345</b><br />
<br />
<b>Notice</b>:  Array to string conversion in <b>/home/michael-heuberger/code/test/public/wp-content/plugins/ninja-forms/includes/Database/Models/Submission.php</b> on line <b>345</b><br />
"#","Date Submitted","Name","Email","Subject","Videomail","Message"
"30","05/01/2017","sdfsdfsdf","sdfsdf@sdfsdf.com","sfsdf","Array,320,240,ninja-forms-videomail-local,69633025843,1493630156012,https://videomail.io/videomail/69633025843,11e7-2e4e-c1e9eef0-bb5b-81449e0c8ba0,1 hour,1493633756012,Nina Forms Videomail Example,https://videomail.io/videomail/69633025843/type/webm/,https://videomail.io/videomail/69633025843/poster/,Array,/reply/69633025843,https://videomail.io/correct/69633025843,May 1, 2017, 9:15 PM,May 1, 2017, 10:15 PM",""

I think a function is missing in the NF_Videomail_Fields_Videomail class, this to extract the Videomail value from the Videomail array.

What CSV related function of the NF_Abstracts_Field class should I override for this?