Error – Conflict with 2 other plugins

Hello,
We’ve been using Duplicate Post for quite some time and it normally works without error.
Recently whenever we hit the clone button, we get a pair of errors indicating two of our other plugins are having trouble with cloning the post.

Here are the plugins and the errors:
Social Media Feather 1.8.4:
Notice: Trying to get property of non-object in /home/chawoo37/dev.rvtravel.com/wp-content/plugins/social-media-feather/synved-social/synved-social-setup.php on line 845

Warning: Cannot modify header information – headers already sent by (output started at /home/chawoo37/dev.rvtravel.com/wp-content/plugins/social-media-feather/synved-social/synved-social-setup.php:845) in /home/chawoo37/dev.rvtravel.com/wp-includes/pluggable.php on line 1216

Poll, Survey, Quiz, Slideshow & Form Builder 19.2.5 by OpinionStage:

Notice: Trying to get property of non-object in /home/chawoo37/dev.rvtravel.com/wp-content/plugins/social-polls-by-opinionstage/includes/opinionstage-article-placement-functions.php on line 13

Warning: Cannot modify header information – headers already sent by (output started at /home/chawoo37/dev.rvtravel.com/wp-content/plugins/social-polls-by-opinionstage/includes/opinionstage-article-placement-functions.php:13) in /home/chawoo37/dev.rvtravel.com/wp-includes/pluggable.php on line 1216

I realize that this may also be a combination of errors including a problem with our theme, but the only time we see these errors is when we try to duplicate a post (any post) using your plugin.

Hope you have some ideas!
Thanks,
Kim