{module}: a '{event}' before-handler threw; the action was cancelled.

Warnings reference › *.beforeThrow:*:*

Identifier

*.beforeThrow:*:*

Raised by

Shared across modules

Since

1.53.0

What happened

A before-event handler on a module viewer threw. A before-handler decides whether an action happens, so a throw is treated as a veto - the action was cancelled - and is reported rather than swallowed, because a cancel nobody asked for looks exactly like a broken feature. The key names the module, the event and the handler.

The fix

The error is attached to the console line. If you meant to veto, return false (or a promise resolving to false) rather than throwing; if you did not, fix the handler.

The smallest fix

kanban.on('beforeCardMove', (e) => { if (!allowed(e)) return false; });

Reference

Covered in full at the API reference.