diff --git a/packages/core/client/src/schema-component/antd/variable/TextArea.tsx b/packages/core/client/src/schema-component/antd/variable/TextArea.tsx
index 27ea75ee2..1367d8e8e 100644
--- a/packages/core/client/src/schema-component/antd/variable/TextArea.tsx
+++ b/packages/core/client/src/schema-component/antd/variable/TextArea.tsx
@@ -229,19 +229,21 @@ export function TextArea(props) {
       const sel = window.getSelection?.();
       if (sel) {
         const children = Array.from(current.childNodes) as HTMLElement[];
-        if (range[0] === -1) {
-          if (range[1]) {
-            nextRange.setStartAfter(children[range[1] - 1]);
+        if (children.length) {
+          if (range[0] === -1) {
+            if (range[1]) {
+              nextRange.setStartAfter(children[range[1] - 1]);
+            }
+          } else {
+            nextRange.setStart(children[range[0]], range[1]);
           }
-        } else {
-          nextRange.setStart(children[range[0]], range[1]);
-        }
-        if (range[2] === -1) {
-          if (range[3]) {
-            nextRange.setEndAfter(children[range[3] - 1]);
+          if (range[2] === -1) {
+            if (range[3]) {
+              nextRange.setEndAfter(children[range[3] - 1]);
+            }
+          } else {
+            nextRange.setEnd(children[range[2]], range[3]);
           }
-        } else {
-          nextRange.setEnd(children[range[2]], range[3]);
         }
         nextRange.collapse(true);
         sel.removeAllRanges();