DioxusLabs/dioxus · error

dynamic node should belong to an anchor

Error message

dynamic node should belong to an anchor

What it means

Internal mount-table invariant: a dynamic node index was not found in any dynamic anchor of the mounted vnode. Every dynamic slot must belong to exactly one anchor; firing indicates vnode/anchor bookkeeping drift.

Source

Thrown at packages/core/src/mount.rs:225

    pub(crate) fn logical_parent(&self) -> Option<MountId> {
        self.logical_parent
    }

    pub(crate) fn render_parent(&self) -> Option<MountedParent> {
        self.render_parent
    }

    pub(crate) fn node(&self) -> &VNode {
        &self.node
    }

    fn dynamic_node_anchor_index(&self, dyn_node_idx: usize) -> usize {
        self.node
            .dynamic_anchors()
            .find(|anchor| anchor.nodes().any(|slot| slot.index() == dyn_node_idx))
            .map(|anchor| anchor.anchor_index())
            .expect("dynamic node should belong to an anchor")
    }

    fn dynamic_offset(&self) -> usize {
        self.anchor_count as usize
    }

    fn dynamic_slot(&self, idx: usize) -> PackedMountedSlot {
        self.slots[self.dynamic_offset() + idx]
    }

    fn dynamic_slot_mut(&mut self, idx: usize) -> &mut PackedMountedSlot {
        let offset = self.dynamic_offset();
        &mut self.slots[offset + idx]
    }

    fn anchor_slot(&self, idx: usize) -> PackedMountedSlot {
        self.slots[idx]
    }

View on GitHub (pinned to 24f6a829df)

Solutions

1. This is an internal invariant about dynamic node anchors. Report it with a minimal reproduction to the Dioxus issue tracker.

When it happens

Trigger: Thrown at packages/core/src/mount.rs:225 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@24f6a829df (2026-08-23). Data as JSON: /api/errors/6b44d59dfcaa6f8f. Report an issue: GitHub.