Call to a member function getFormID() on null -> Again

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Dear Corretje

On creating a new form we get an error:

Call to a member function getFormID() on null

We spotted the same error as described in here. But no of the mentioend solutions helped.

Stack Trace:
Error thrown with message "Call to a member function getFormID() on null"
#26 Error in /home/customer/www/_c5_web_ch/packages/formidable_full/elements/dashboard/form/nav.php:7
#25 include in /home/customer/www/_c5_web_ch/concrete/src/View/View.php:442
#24 Concrete\Core\View\View:element in /home/customer/www/_c5_web_ch/packages/formidable_full/single_pages/dashboard/formidable/forms/view.php:17
#23 include in /home/customer/www/_c5_web_ch/concrete/src/View/View.php:233
#22 Concrete\Core\View\View:renderInnerContents in /home/customer/www/_c5_web_ch/concrete/src/View/View.php:211
#21 Concrete\Core\View\View:renderViewContents in /home/customer/www/_c5_web_ch/concrete/src/View/AbstractView.php:151
#20 Concrete\Core\View\AbstractView:render in /home/customer/www/_c5_web_ch/concrete/src/Http/ResponseFactory.php:148
#19 Concrete\Core\Http\ResponseFactory:view in /home/customer/www/_c5_web_ch/concrete/src/Http/ResponseFactory.php:215
#18 Concrete\Core\Http\ResponseFactory:controller in /home/customer/www/_c5_web_ch/concrete/src/Http/ResponseFactory.php:393
#17 Concrete\Core\Http\ResponseFactory:collection in /home/customer/www/_c5_web_ch/concrete/src/Routing/DispatcherRouteCallback.php:34
#16 Concrete\Core\Routing\DispatcherRouteCallback:execute in /home/customer/www/_c5_web_ch/concrete/src/Http/DefaultDispatcher.php:130
#15 Concrete\Core\Http\DefaultDispatcher:handleDispatch in /home/customer/www/_c5_web_ch/concrete/src/Http/DefaultDispatcher.php:57
#14 Concrete\Core\Http\DefaultDispatcher:dispatch in /home/customer/www/_c5_web_ch/concrete/src/Http/Middleware/DispatcherDelegate.php:39

Type: Pre-Sale
Status: In Progress
View Replies:
webpresso replied on at Permalink Reply
I have some observartion on this:

If I create a new form and set «After submission» to «Redirect to another page» the form saves properly. If this «Show message» is active, the error occurs. And the form doesn't save.

Already created forms do not have any issues.
DeWebmakers replied on at Permalink Reply
Just updated the addon!
Hope this fixes the issue
patej replied on at Permalink Reply
I updated to 2.0 now and this problem still exists: choosing "Show message" gives the error above, but choosing "Redirect to page" lets me save the form and I can change the option later to "Show message" without the error.

concrete5 Environment Information

PHP 7.1
C5 8.4.2
Formidable Pro 1.7.1

Browser User-Agent String

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

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