diff --git a/blocksuite/affine/blocks/block-root/src/widgets/linked-doc/linked-doc-popover.ts b/blocksuite/affine/blocks/block-root/src/widgets/linked-doc/linked-doc-popover.ts
index 51aa9e8f08..b36ff8b47f 100644
--- a/blocksuite/affine/blocks/block-root/src/widgets/linked-doc/linked-doc-popover.ts
+++ b/blocksuite/affine/blocks/block-root/src/widgets/linked-doc/linked-doc-popover.ts
@@ -55,7 +55,7 @@ export class LinkedDocPopover extends SignalWatcher(
     }
     this._updateLinkedDocGroupAbortController = new AbortController();
 
-    if (query === null) {
+    if (query === null || query.startsWith(' ')) {
       this.context.close();
       return;
     }
diff --git a/tests/blocksuite/e2e/linked-page.spec.ts b/tests/blocksuite/e2e/linked-page.spec.ts
index 7747ccf959..cd54e221f5 100644
--- a/tests/blocksuite/e2e/linked-page.spec.ts
+++ b/tests/blocksuite/e2e/linked-page.spec.ts
@@ -133,6 +133,23 @@ test.describe('reference node', () => {
     await expect(linkedDocPopover).toBeHidden();
   });
 
+  test('close doc popover when start with space', async ({ page }) => {
+    await enterPlaygroundRoom(page);
+    await initEmptyParagraphState(page);
+    await focusRichText(page);
+    await type(page, '@d');
+    const { linkedDocPopover } = getLinkedDocPopover(page);
+    await expect(linkedDocPopover).toBeVisible();
+    await pressBackspace(page);
+    await expect(linkedDocPopover).toBeVisible();
+    await type(page, ' ');
+    await expect(linkedDocPopover).toBeHidden();
+    await type(page, '@');
+    await expect(linkedDocPopover).toBeVisible();
+    await type(page, ' ');
+    await expect(linkedDocPopover).toBeHidden();
+  });
+
   test('should reference node attributes correctly', async ({
     page,
   }, testInfo) => {