diff --git a/packages/bindx-ui/src/datagrid/columns/has-one-column.tsx b/packages/bindx-ui/src/datagrid/columns/has-one-column.tsx
index a6999ee..1bc2e8b 100644
--- a/packages/bindx-ui/src/datagrid/columns/has-one-column.tsx
+++ b/packages/bindx-ui/src/datagrid/columns/has-one-column.tsx
@@ -1,5 +1,6 @@
 import React, { type ReactElement, type ReactNode, useCallback } from 'react'
 import type { EntityAccessor, EntityDef, FieldRef } from '@contember/bindx'
+import { isPersistedId } from '@contember/bindx'
 import {
 	createRelationColumn,
 	hasOneColumnDef,
@@ -106,8 +107,9 @@ const relationUI = {
 		<RelationFilterUI {...ctx} />
 	),
 	renderCellWrapper: ({ content, item, fieldName, filterName, fieldRef }: RelationCellWrapperContext) => {
-		const id = getRelatedAccessor(item, fieldName)?.id ?? null
-		if (!id) return content
+		const id = getRelatedAccessor(item, fieldName)?.id
+		// An empty relation still has a placeholder id; filtering on it is rejected by the server.
+		if (!id || !isPersistedId(id)) return content
 		return (
 			<DataGridHasOneTooltip field={fieldRef} name={filterName} id={id}>
 				<DataGridTooltipLabel>{content}</DataGridTooltipLabel>
diff --git a/tests/react/dataview/hasOneColumnEmptyCellFilter.test.tsx b/tests/react/dataview/hasOneColumnEmptyCellFilter.test.tsx
new file mode 100644
index 0000000..e8f445e
--- /dev/null
+++ b/tests/react/dataview/hasOneColumnEmptyCellFilter.test.tsx
@@ -0,0 +1,85 @@
+// Regression test for https://github.com/contember/bindx/issues/136
+//
+// A nullable has-one with no related entity still yields a handle whose `id`
+// is a disconnected placeholder id. The cell must not offer include/exclude
+// actions on it: a filter on that id cannot match anything, and a server
+// rejects it as an invalid id.
+import '../../setup'
+import { afterEach, describe, expect, test } from 'bun:test'
+import { act, cleanup, render, waitFor } from '@testing-library/react'
+import React from 'react'
+import { BindxProvider, MockAdapter } from '@contember/bindx-react'
+import { DataGrid } from '@contember/bindx-dataview'
+import { DataGridAutoTable, DataGridHasOneColumn } from '@contember/bindx-ui'
+import { schema, testSchema } from '../../shared/index.js'
+
+afterEach(async () => {
+	await act(async () => {
+		cleanup()
+		await new Promise(resolve => setTimeout(resolve, 0))
+	})
+})
+
+function renderGrid(): HTMLElement {
+	const adapter = new MockAdapter({
+		Article: {
+			'article-1': {
+				id: 'article-1',
+				title: 'With author',
+				content: '',
+				author: { id: 'author-1', name: 'Alice', email: 'alice@example.com' },
+				tags: [],
+			},
+			'article-2': {
+				id: 'article-2',
+				title: 'Without author',
+				content: '',
+				author: null,
+				tags: [],
+			},
+		},
+		Author: {
+			'author-1': { id: 'author-1', name: 'Alice', email: 'alice@example.com' },
+		},
+		Tag: {},
+		Location: {},
+	}, { delay: 0 })
+
+	const { container } = render(
+		<BindxProvider adapter={adapter} schema={testSchema}>
+			<DataGrid entity={schema.Article}>
+				{it => (
+					<>
+						<DataGridHasOneColumn field={it.author} header="Author">
+							{author => author.name.value ?? '—'}
+						</DataGridHasOneColumn>
+						<DataGridAutoTable />
+					</>
+				)}
+			</DataGrid>
+		</BindxProvider>,
+	)
+	return container
+}
+
+function authorCells(container: HTMLElement): HTMLElement[] {
+	return Array.from(container.querySelectorAll<HTMLElement>('[data-testid="datagrid-cell-author"]'))
+}
+
+describe('has-one column cell filter affordance', () => {
+	test('should not offer include/exclude on a cell whose relation is empty', async () => {
+		const container = renderGrid()
+
+		await waitFor(() => {
+			expect(authorCells(container)).toHaveLength(2)
+		})
+
+		const connectedCell = authorCells(container).find(cell => cell.textContent?.includes('Alice'))
+		const emptyCell = authorCells(container).find(cell => cell.textContent?.includes('—'))
+		expect(connectedCell).toBeDefined()
+		expect(emptyCell).toBeDefined()
+
+		expect(connectedCell!.querySelector('[data-bindx-tooltip]')).not.toBeNull()
+		expect(emptyCell!.querySelector('[data-bindx-tooltip]')).toBeNull()
+	})
+})