diff --git a/blocksuite/framework/store/src/model/block/flat-sync-controller.ts b/blocksuite/framework/store/src/model/block/flat-sync-controller.ts
index 7c58734bb6..ce60588204 100644
--- a/blocksuite/framework/store/src/model/block/flat-sync-controller.ts
+++ b/blocksuite/framework/store/src/model/block/flat-sync-controller.ts
@@ -72,6 +72,7 @@ export class FlatSyncController {
         if (key in proxy) {
           return;
         }
+        if (value === undefined) return;
         proxy[key] = value;
       });
     }
diff --git a/blocksuite/framework/store/src/model/block/sync-controller.ts b/blocksuite/framework/store/src/model/block/sync-controller.ts
index 50c817e5b6..55346347f1 100644
--- a/blocksuite/framework/store/src/model/block/sync-controller.ts
+++ b/blocksuite/framework/store/src/model/block/sync-controller.ts
@@ -302,7 +302,9 @@ export class SyncController {
         if (key in props) return;
 
         const yValue = native2Y(value);
-        this.yBlock.set(`prop:${key}`, yValue);
+        if (value !== undefined) {
+          this.yBlock.set(`prop:${key}`, yValue);
+        }
         props[key] = this._getPropsProxy(key, yValue);
       });
     }