selected_input implementation when currentKey not set

[zaus]

from https://wordpress.org/support/topic/warning-in_array-expects-parameter-2-to-be-array-7?replies=1#post-7947435

I am using Gravity Forms.
Forms: 3rd-Party Integration version 1.6.6.1

Under the 3rd Party Integration Settings, warnings are displayed next to the checkboxes for Debug Mode, Logging Fallback, and Logging Fallback - include service.

The warning looks like this:
Warning: in_array() expects parameter 2 to be array, string given in /home/prod2gig/public_html/wp-content/plugins/forms-3rdparty-integration/forms-3rdparty-integration.php on line 393

Is this supposed to pop up next to the checkboxes?

From d84510c#diff-f57ede8c76bca4f86bf01fc4ae435c0bR402