Hey there,
I have the exact same problem which was discussed in https://theeventscalendar.com/support/forums/topic/error-on-ninja-forms-submission but was never followed up properly.
So I wonder if there is a solution for this problem?
The error message I am getting after submit of the ninja form when set to “success message” is:
“Notice: Trying to get property of non-object in … wp-content/plugins/the-events-calendar/lib/tribe-templates.class.php on line 688.”
I also tried the redirect option which does not seem to work anymore all of a sudden but comes up with another even longer error message like:
“Notice: Trying to get property of non-object in … wp-content/plugins/the-events-calendar/lib/tribe-templates.class.php on line 688.
Warning: cannot modify header information – headers already sent by (output started at /home/…wp-content/plugins/the-events-calendar/lib/tribe-templates.class.php on line 688) in /home/…/wp-includes/pluggable.php on line 1178
Thanks a lot!
Torsten