When running the Checkers/Draughts Blazor Server app, you may occasionally see Blazor’s built-in error banner at the bottom of the page:

“An unhandled error has occurred. Reload 🗙”

The issue

This banner typically appears when a Blazor Server circuit encounters an unhandled exception or disconnect/reconnect failure.

It’s useful during development, but it can be disruptive for users if it appears repeatedly.

The kludge (CSS hide)

As a UI-only workaround, you can hide the banner using CSS.

In the app, update wwwroot/app.css:

#blazor-error-ui {
    display: none !important;
}

Important note

This does not fix the underlying problem (server exception/circuit instability). It only hides the visual banner while you continue to investigate and address the root cause.


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