diff --git a/packages/server/src/index.ts b/packages/server/src/index.ts
index 0187144..71c72c5 100644
--- a/packages/server/src/index.ts
+++ b/packages/server/src/index.ts
@@ -738,6 +738,8 @@ wss.on("connection", (socket, req) => {
     roomsCreated: 0, lastCatchUpAt: 0, hotseatReports: 0,
   };
   sessions.add(session);
+  // A socket's own error (a frame over the limit, a malformed one) closes that socket, never the server.
+  socket.on("error", () => socket.terminate());
   send(socket, { type: "welcome", game: "wizwar" });
 
   socket.on("close", () => {