websocket connection crash

we just encountered a crash:
I 15:20:35.441784 Websocket: client receive thread started
I 15:20:35.442135 Websocket: send on connect update
E 15:20:59.237134 Websocket: caught exception while receiving. The WebSocket stream was gracefully closed at both endpoints [boost.beast.websocket:1 at /us    r/include/boost/beast/websocket/impl/stream.hpp:365 in function 'do_fail']