diff --git a/app/src/protyle/wysiwyg/index.ts b/app/src/protyle/wysiwyg/index.ts
index 566553ab9..b8dd2439b 100644
--- a/app/src/protyle/wysiwyg/index.ts
+++ b/app/src/protyle/wysiwyg/index.ts
@@ -877,7 +877,11 @@ export class WYSIWYG {
                 let firstBlockElement = hasClosestBlock(firstElement);
                 if (moveEvent.clientY > y) {
                     if (!startFirstElement) {
-                        startFirstElement = firstElement;
+                        // 向上选择导致滚动条滚动到顶部再向下选择至 > y 时，firstBlockElement 为 undefined https://ld246.com/article/1705233964097
+                        if (!firstBlockElement) {
+                            firstBlockElement = protyle.wysiwyg.element.firstElementChild as HTMLElement;
+                        }
+                        startFirstElement = firstBlockElement;
                     }
                 } else if (!firstBlockElement &&
                     // https://github.com/siyuan-note/siyuan/issues/7580