Problems adding network-server


I’ve installed Lora via docker-compose on Debian Linux but I’ve got a problem, when I try to add network-server via myhost:8080, menu: Network-servers / Add:

Logs say that there is “unexpected end of JSON input”:

appserver_1 | time=“2019-03-01T11:22:24Z” level=warning msg=“creating insecure network-server client” server=“localhost:8003”
appserver_1 | time=“2019-03-01T11:22:24Z” level=error msg=“js: error handling request” error=“unexpected end of JSON input”
appserver_1 | time=“2019-03-01T11:22:25Z” level=error msg=“finished unary call with code Unknown” error=“rpc error: code = Unknown desc = context deadline exceeded” grpc.code=Unknown grpc.method=Create grpc.service=api.NetworkServerService grpc.start_time=“2019-03-01T11:22:24Z” grpc.time_ms=508.43 peer.address=“” span.kind=server system=grpc

How can I fix it?