Unable to delete a test case run from a test session until I pass that test case

Hello.
I've found a strange behaviour on your last version 9.0.5, on both old style and new graphic interface.
If I try to remove a "test case run" from a test session before running that test case, I get the following Javascript error:
 

However, after I flag the taste case as passed or failed (by clickin on OK or KO icons) I am able to delete the test case.
May you please be so gently to have a look?
Really many thanks.

Regards

projeqtorDialog.js?version=V9.0.5.0280:5475 Uncaught TypeError: Cannot set property 'value' of null
    at removeTestCaseRun (projeqtorDialog.js?version=V9.0.5.0280:5475)
    at HTMLAnchorElement.onclick (main.php:1)