diff --git a/platform/mv3/extension/js/develop.js b/platform/mv3/extension/js/develop.js
index 0413c708f..978dee73c 100644
--- a/platform/mv3/extension/js/develop.js
+++ b/platform/mv3/extension/js/develop.js
@@ -508,7 +508,7 @@ class Editor {
             }
         }
         view.dispatch({
-            selection: { anchor: from, head: to+1 }
+            selection: { anchor: from, head: Math.min(to+1, doc.length) }
         });
         view.focus();
         return true;