windmill-labs/windmill · error

Nested argument not found!

Error message

Nested argument not found!

What it means

Same traversal guard as 1335 but in AddPropertyV2.svelte: while walking `argPath` through the (Svelte 5 $state) schema's nested `properties`, a missing intermediate property name aborts the delete with this error.

Source

Thrown at frontend/src/lib/components/schema/AddPropertyV2.svelte:129

		}

		if (argError !== '') {
			sendUserToast(argError, true)
		}
	}

	export function handleDeleteArgument(argPath: string[], nschema?: Schema): void {
		try {
			let modifiedObject: Schema = { ...(nschema ?? schema) }
			let modifiedProperties = modifiedObject.properties as object
			let argName = argPath.pop() as string

			argPath.forEach((property) => {
				if (Object.keys(modifiedProperties).includes(property)) {
					modifiedObject = modifiedProperties[property]
					modifiedProperties = modifiedObject.properties as object
				} else {
					throw Error('Nested argument not found!')
				}
			})

			if (Object.keys(modifiedProperties).includes(argName)) {
				delete modifiedProperties[argName]

				if (modifiedObject.required) {
					modifiedObject.required = schema.required.filter((arg) => arg !== argName)
				}
				if (modifiedObject.order) {
					modifiedObject.order = modifiedObject.order.filter((arg) => arg !== argName)
				}
			} else {
				throw Error('Argument not found!')
			}
			syncOrders(modifiedObject)
			schema = $state.snapshot(modifiedObject)
		} catch (err) {

View on GitHub (pinned to e474e8803c)

Solutions

1. Refresh the schema editor and retry
2. Confirm the nested parent object still exists with the exact name in argPath
3. Rebuild the delete action from the current UI selection rather than a stored path
4. Edit the schema JSON directly to remove the nested property

Example fix

// defensive traversal
for (const property of argPath) {
  if (!(property in (modifiedProperties ?? {}))) { await reloadSchema(); return; }
  modifiedObject = modifiedProperties[property];
  modifiedProperties = modifiedObject.properties;
}

let node = $state.snapshot(schema);
for (const seg of argPath) {
  if (!node?.properties?.[seg]) { console.warn('Stale nested path:', seg); return; }
  node = node.properties[seg];
}

function nestedPathExists(schema: any, path: string[]): boolean {
  let node = schema;
  for (const seg of path) {
    if (!node?.properties || !(seg in node.properties)) return false;
    node = node.properties[seg];
  }
  return true;
}

try { await handleDeleteArgument(arg); } catch (e) {
  if (/Nested argument not found/.test(String(e))) await reloadSchema();
  else throw e;
}

When it happens

Trigger: Deleting a nested argument when the schema no longer contains one of the intermediate objects in argPath — parent deleted, renamed, or schema snapshot out of sync with the UI tree.

Common situations: Edits made in another tab or by a collaborator, external schema replacement, or stale argPath after undo/redo in the V2 schema editor.

Related errors

• Nested argument not found!
• Argument not found!
• Argument not found!
• Column ${column.field} is not nullable and has no default va
• BigQuery requires a dataset (schema) name

AI-assisted analysis of windmill-labs/windmill@e474e8803c (2026-09-03). Data as JSON: /api/errors/0bd66711f712468a. Report an issue: GitHub.