clockworklabs/SpacetimeDB · error

Attempt to remove non-existent update callback

Error message

Attempt to remove non-existent update callback

What it means

Error "Attempt to remove non-existent update callback" thrown in clockworklabs/SpacetimeDB.

Source

Thrown at sdks/rust/src/callbacks.rs:181

        // but we want to assert that we actually removed a callback,
        // we just don't want to invoke it.
        // So we have to `let _ =`.
        let _ = self
            .on_delete
            .remove(&callback_id)
            .expect("Attempt to remove non-existent delete callback");
    }

    pub(crate) fn remove_on_update(&mut self, callback_id: CallbackId) {
        // Ugly: `impl FnMut` is `must_use`.
        // If we don't `.expect` this, no diagnostic,
        // but we want to assert that we actually removed a callback,
        // we just don't want to invoke it.
        // So we have to `let _ =`.
        let _ = self
            .on_update
            .remove(&callback_id)
            .expect("Attempt to remove non-existent update callback");
    }

    fn invoke_on_insert(&mut self, ctx: &M::EventContext, row: &dyn Any) {
        for callback in self.on_insert.values_mut() {
            callback(ctx, row);
        }
    }

    fn invoke_on_delete(&mut self, ctx: &M::EventContext, row: &dyn Any) {
        for callback in self.on_delete.values_mut() {
            callback(ctx, row);
        }
    }

    fn invoke_on_update(&mut self, ctx: &M::EventContext, old: &dyn Any, new: &dyn Any) {
        for callback in self.on_update.values_mut() {
            callback(ctx, old, new);
        }

View on GitHub (pinned to 524b4487d9)

When it happens

Trigger: Thrown at sdks/rust/src/callbacks.rs:181 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of clockworklabs/SpacetimeDB@524b4487d9 (2026-08-16). Data as JSON: /api/errors/726b483a39cbaa57. Report an issue: GitHub.