error when going back to a screened paper

[esyriani]

Describe the bug
When I go back to a paper that has been previously screened, I get an error on the top of the page. But it does not seem to affect the behavior of the application, so it is just annoying.

To Reproduce
Steps to reproduce the behavior:

1. Screen a paper
2. Go to Papers in this phase. Choose any list, for example All
3. See error on top of the page

Expected behavior
There should be no error.

Screenshots
Here is the error:

A PHP Error was encountered

Severity: Warning

Message: count(): Parameter must be an array or an object that implements Countable

Filename: relis/Manager.php

Line Number: 4182

Backtrace:

File: /local/home/relis/public_html/relis_app/controllers/relis/Manager.php
Line: 4182
Function: _error_handler

File: /local/home/relis/public_html/index.php
Line: 315
Function: require_once