WARNING: Missing argument 1 for get_post()

Hello,

I used BackWPup on my WordPress 3.4.2 for almost two years without any problem, thanks go to the developer. Lately, I got Dropbox handshake failure errors, so I upgraded BackWPup from 3.1.2 to 3.1.4.

I re-authenticated with Dropbox and the backup worked, however, I am getting warnings I have never seen before:

[12-Dec-2014 00:55:13] Database backup done!
[12-Dec-2014 00:55:13] Restart will be executed now.
[12-Dec-2014 00:55:15] 1. Trying to make a list of folders to back up …
[12-Dec-2014 00:55:25] 959 folders to backup.
[12-Dec-2014 00:55:25] Restart will be executed now.
[12-Dec-2014 00:55:26] 1. Trying to create a WordPress export to XML file …
[12-Dec-2014 00:55:26] WARNING: Missing argument 1 for get_post(), called in /home/***/www/wp-content/plugins/backwpup/inc/class-jobtype-wpexp.php on line 695 and defined
….
[12-Dec-2014 00:55:34] WARNING: Missing argument 1 for get_post(), called in /home/***/www/wp-content/plugins/backwpup/inc/class-jobtype-wpexp.php on line 695 and defined
[12-Dec-2014 00:55:34] Check WP Export file …
[12-Dec-2014 00:55:34] WP Export file is a valid WXR file.
[12-Dec-2014 00:55:34] Compressing file …
[12-Dec-2014 00:55:35] Compressing done.
[12-Dec-2014 00:55:35] Added XML export …
…
[12-Dec-2014 01:06:23] Database check done!
[12-Dec-2014 01:06:23] One old log deleted
[12-Dec-2014 01:06:23] WARNING: Job finished with warnings in 682 seconds. Please resolve them for correct execution.

This warning at line 695 appears 526 times (3 times the number of posts + 1).

Has anyone an idea of what is going wrong and if it makes the backup corrupt?

Thanks,

jb

https://wordpress.org/plugins/backwpup/