Impossibility to change the name of a testing folder full of Libraries [4.16-1747]

[Meganounours]

Cerberus Version : 4.16-1747

Hello, I have a problem concerning the renaming of one of my folders.

When I try to change the name of a testing folder, I get this error mesage :

An unexpected problem occurred. com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (cerberus.testcasestep, CONSTRAINT FK_testcasestep_02 FOREIGN KEY (LibraryStepTest, LibraryStepTestcase) REFERENCES testcase (Test, Testcase) ON DELETE SET NULL ON UPDATE CASCAD)

The folder is full of tests that are Libraries. When I try to change the name of another folder with only a few libraries in it, it changes with no problems.