fix very fatal issue

src/ws/streams.js

@@ -37,11 +37,13 @@ const recvUpdate = async (channel, data) => {
 
 const sendInitial = async (id) => {
   const c = connections[id]
-  const stream = await crud['streams'].getById(c.streamid)
-  c.connection.send(JSON.stringify({
-    event: 'streams:read',
-    data: stream,
-  }))
+  if (c.streamid !== null) {
+    const stream = await crud['streams'].getById(c.streamid)
+    c.connection.send(JSON.stringify({
+      event: 'streams:read',
+      data: stream,
+    }))
+  }
 }
 
 module.exports = {