Error Invalid cookie value in STH log

[osfrance]

Hi,
Because I have horizon, wirecloud and sth-comet in the same docker machine, I set in wirecloud settings.py :
SESSION_COOKIE_NAME = "wcsessionid"
CSRF_COOKIE_NAME = "wccsrftoken"

But when I want to use the plugin STH source, I had an error message in comet console :

time=2017-08-11T08:00:40.902Z | lvl=WARN | corr=20b047d2-7ed1-45c8-af7a-52c28a5eaa64 | trans=20b047d2-7ed1-45c8-af7a-52c28a5eaa64 | op=OPER_STH_GET | from=IP_MASKED | srv=nca | subsrv=/test1 | comp=STH | msg=GET /STH/v1/contextEntities/type/obj-test/id/test1/attributes/temperature?lastN=864000&dateFrom=2017-08-01T08%3A00%3A40.415Z, event={"request":"1502438440900:comet:1:j67gxckc:10014","timestamp":1502438440901,"tags":["state","error"],"data":{"header":"csrftoken=TOKEN_MASKED, sessionid="SESSION_MASKED","errors":[{"name":"csrftoken","value":"TOKEN_MASKED, sessionid="SESSION_MASKED","settings":{"strictHeader":true,"ignoreErrors":false,"isSecure":false,"isHttpOnly":false,"path":null,"domain":null,"ttl":null,"encoding":"none"},"reason":"Invalid cookie value"}]},"internal":true}

If I try the REST request : GET http://IP_MASKED:8666/STH/v1/contextEntities/type/obj-test/id/test1/attributes/temperature?hLimit=3&hOffset=0
with setted header FIWARE_SERVICE and FIWARE_SERVICE_PATH but without cookie, it's working.

Thanks for help,