Fix handler for empty websocket messages

1 files changed, 3 insertions, 1 deletions

diff --git a/frontend/src/utils/websocket.js b/frontend/src/utils/websocket.js
index b01531cf..6acd0806 100644
--- a/frontend/src/utils/websocket.js
+++ b/frontend/src/utils/websocket.js
@@ -41,7 +41,9 @@ export const createWsConnection = (headers: Object = {}): Promise<SocketObjectTy
 export const createSubscriptionChannel = (socket: SocketType, path: string) => {
   return eventChannel((emitter: (data: any) => void) => {
     const socketSubscription: SocketSubscriptionType = socket.subscribe(path, (event: SocketEventType) => {
-      emitter(JSON.parse(event.body));
+      // not all events have a body
+      const value = event.body && JSON.parse(event.body);
+      emitter(value);
     });
     return () => socketSubscription.unsubscribe();
   });