Unable to modify or save usercertificate;binary

Hello,

 I'm runing Luma 2.3 with python-ldap 2.0.6, PyQt 3.15 and Qt 3.3.5.
I'm trying to set the "usercertificate;binary" attribute for an entry.
So i'm clicking on the "Edit attribute" icon, but i have the following
error when i click on the file browser icon:

 File "/usr/local/lib/luma/base/utils/gui/editors/BinaryEditor.py",
line 70, in showFileDialog
   None, 1)
Reason: exceptions.RuntimeError cannot pass None as argument 0 in this call

 But i'm still able to add a certificate (provided it's encoded in
DER format). Then i'm trying to save the "usercertificate;binary" from
another user. When i click on the save/export icon, i have the
following error:

 File "/usr/local/lib/luma/base/utils/gui/AdvancedObjectWidget.py",
line 446, in modifierClicked
   self.exportAttribute(attributeName, index)
 File "/usr/local/lib/luma/base/utils/gui/AdvancedObjectWidget.py",
line 461, in exportAttribute
   None, 1))
Reason: exceptions.RuntimeError cannot pass None as argument 0 in this call

Ps: I attached the ldif and the certificate in DER format, i used for tests.

Regards,
Vincent

ldif
Description: Binary data

cert.der
Description: application/x509-ca-cert