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RealTime subscribe throws Concurrent modification during iteration: _Map len:0

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darwinmorochoOriginal post

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Hi I have installed appwrite in my ubuntu server with docker and nginx. Due to my server already has some apps running with pm2 I had to run my appwrite app using a reverse proxy.

When I use the next code to subscribe to realtime events it works for a few seconds

Dart
   final Realtime _realtime = Realtime(client);
.
.
.
    final userChannel = 'databases.my_db.collections.users.documents.$userId';
    final membershipChannel = 'databases.my_db.collections.memberships.documents.$userId';
    
// this works for around 30 seconds, after that time the appwrite sdk throws 
// Unhandled Exception: Concurrent modification during iteration: _Map len:0.
// And the realtime stop working
    _subscription = _realtime.subscribe(
      [userChannel, membershipChannel],
    );

Next after a few seconds I have this error in my console and the realtime stops working

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Concurrent modification during iteration: _Map len:0. #0 _CompactIterator.moveNext (dart:collection-patch/compact_hash.dart:714:7) #1 RealtimeMixin._createSocket.<anonymous closure> (package:appwrite/src/realtime_mixin.dart:91:49) #2 _RootZone.runGuarded (dart:async/zone.dart:1582:10) #3 _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:392:13) #4 _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:402:7) #5 _BufferingStreamSubscription._close (dart:async/stream_impl.dart:291:7) #6 _ForwardingStream._handleDone (dart:async/stream_pipe.dart:99:10) #7 _ForwardingStreamSubscription._handleDone (dart:async/stream_pipe.dart:161:13) #8 _RootZone.runGuarded (dart:async/zone.dart:1582:10) #9 _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:392:13)
darwinmorocho

Rank 1: Thread

This is my nginx configuration

server { server_name app.codergym.fit; location / { proxy_pass http://localhost:81; proxy_set_header Host $host; } location /v1/realtime { proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; proxy_pass http://localhost:81/v1/realtime; } listen 443 ssl; # managed by Certbot ssl_certificate /etc/letsencrypt/live/encoding.meedu.app/fullchain.pem; # managed by Certbot ssl_certificate_key /etc/letsencrypt/live/encoding.meedu.app/privkey.pem; # managed by Certbot include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot } server { if ($host = app.codergym.fit) { return 301 https://$host$request_uri; } # managed by Certbot server_name app.codergym.fit; listen 80; return 404; # managed by Certbot }

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