Steps to reproduce the issue

Create a superuser contact.
Create another contact.
(The super user should be the author of some articles.)

Create a Single Contact menu item displaying the superuser contact.

Make sure the Contact Select List OR the User Articles parameters are set to show.

Display the contact in frontend.

Expected result

A Select box is displayed.
A specific part lists articles

Actual result

[16-Oct-2020 07:01:18 UTC] PHP Warning: mysqli_stmt::bind_param(): Number of variables doesn't match number of parameters in prepared statement in root/libraries/vendor/joomla/database/src/Mysqli/MysqliStatement.php on line 420

and no display with error 0

@SharkyKZ @richard67