"Object duplication error" adding new extension

[crsc]

Environment: 5.0.3648; Database from V5 Beta restored to 5.0.3648

I'm trying to add a new extension. The following error triggers:

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Cannot save DN object: ERROR: duplicate key violates unique constraint "dn_pkey"<br>#0 C:\Program Files\3CX PhoneSystem\Data\Http\functions\CallContext.php(94): safeExec(Object(PDOStatement), 'Cannot save DN ...')<br />
#1 C:\Program Files\3CX PhoneSystem\Data\Http\functions\fDN.php(162): CallContext->safeExec('insert into dn ...', Array, 'Cannot save DN ...')<br />
#2 C:\Program Files\3CX PhoneSystem\Data\Http\functions\fDN.php(121): fDN::saveDN(Object(oDN))<br />
#3 C:\Program Files\3CX PhoneSystem\Data\Http\functions\fExtension.php(112): fDN::save(Object(oDN))<br />
#4 C:\Program Files\3CX PhoneSystem\Data\Http\functions\fUser.php(41): fExtension::save(Object(oExtension))<br />
#5 C:\Program Files\3CX PhoneSystem\Data\Http\user_extension_info.php(1046): fUser::save(Object(oUser))<br />
#6 C:\Program Files\3CX PhoneSystem\Data\Http\functions\gui\fmPage.php(70): aOnOk->execute()<br />
#7 C:\Program Files\3CX PhoneSystem\Data\Http\functions\gui\fmPage.php(85): fmPage->processData()<br />
#8 C:\Program Files\3CX PhoneSystem\Data\Http\functions\gui\fmPageEx.php(110): fmPage->toHTML()<br />
#9 C:\Program Files\3CX PhoneSystem\Data\Http\user_extension_info.php(1096): fmCustomPage->toHTML()<br />
#10 {main}
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Any clues on how to fix it? I can work with a database but would like some advise since I'm not an expert on Postgres nor have I dissected the 3CX database.

Thanks.

 

[Mori]

Just backup then restore the system file again.
It should be solved this issue.

This error only affect the CDR (call log). The call function should be works fine.