fix: client no longer segfaults if client goes offline whilst there a…

…re pending requests

src/rconpp/client.cpp

@@ -241,6 +241,10 @@ void rconpp::rcon_client::start(bool return_after) {
 			}
 
 			for (const queued_request& request : requests_queued) {
+				// If we're closing the connection down, we need to back out.
+				if(!connected)
+					return;
+
 				// Send data to callback if it's been set.
 				if (request.callback)
 					request.callback(send_data_sync(request.data, request.id, request.type));