When i click message button I got generalexceptionmessage
In browser POST answer are:

[{"error":false,"data":{"favourites":0,"types":

{"1":9,"2":0}

}},{"error":false,"data":{"favourites":0,"types":

{"1":0,"2":0}

}}]

and

{"error":"Exception - __clone method called on non-object","errorcode":"generalexceptionmessage","stacktrace":null,"debuginfo":null,"reproductionlink":null}

on apache error I have:

[Sun Feb 03 17:14:53.734614 2019] [php7:notice] [pid 10176] [client XXXXXXXXXXX:51690] Default exception handler: Exception - __clone method called on non-object Debug: \nError code: generalexceptionmessage\n* line 704 of /message/classes/api.php: Error thrown\n* line 1654 of /message/externallib.php: call to core_message\\api::get_conversations()\n* line 244 of /lib/externallib.php: call to core_message_external::get_conversations()\n* line 59 of /lib/ajax/service.php: call to external_api::call_external_function()\n, referer: https://XXXXXXXXXXXXXX/my/index.php?lang=en