Page rendering is broken when an Exception is thrown

[trasher]

When an Exception is thrown in one tab, display is entirely broken:

Several JS errors appears:

Uncaught SyntaxError: redeclaration of let GlpiCommonAjaxController
Uncaught SyntaxError: redeclaration of const setRichTextEditorContent
Uncaught SyntaxError: redeclaration of const glpi_toast

The current tab is stored in session to be displayed per default, and it's not possible to change tab from currentbroken page. We have to logout/login or go to a non broken itemtype page to change session stored tab.