JoomSEF and Module CPSearch

Search with special character replace it for "??" in adress bar.
Maybe an extension exist for JoomSEF4 ?

Module CPSearch is inherently non-SEF, just like the other search engines.

It is advisable to selectively exclude Custom Properties extension from being processed by JoomSEF. As far as I remember there should be a way to tell JoomSEF to ignore Custom Properties and let its urls be processed by native Joomla SEF functions and/or to leave CP urls untouched.

I've just valid Not Using SEF in JoomSEF for your component.
Problem solved.