What causes a lobby ready-check desync?

Ready states are tracked per client without authoritative sync, so players see different ready statuses, and the match can start with players who are not actually ready (or fail to start).

How do I catch this when it only happens for some players?

Capture it automatically from the player's device with the full stack trace, the device and OS, the build, and a breadcrumb trail of what they did. That turns a vague complaint into a specific, reproducible issue you can fix without owning the hardware it happens on.

How to Fix a Lobby Ready-Check Desyncing

Quick answer: Track ready state authoritatively on the host or server, broadcast each change to all members, and start only when the authoritative state shows everyone ready.

A lobby ready-check desync is non-authoritative ready state. Here is how to fix it.

How to fix it

1. Track ready state authoritatively

Keep each player's ready status on the host or server as the source of truth, rather than each client tracking its own view, which diverges. The authoritative state decides who is ready.

2. Broadcast every change

When a player toggles ready, broadcast the change to all lobby members so everyone's view updates together. Updating only locally leaves players seeing stale ready states for others.

3. Start from the authoritative state

Begin the match only when the authoritative ready state shows everyone ready, not when a client thinks so. This prevents starting with unready players or failing to start when everyone actually is ready.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.

Ship the fix, watch the signature disappear from the next build. That's how you know it's really gone.