diff --git a/src/pages/taskmanager/components/task-detail/comment/List.tsx b/src/pages/taskmanager/components/task-detail/comment/List.tsx
index e5de954..c4f80bb 100644
--- a/src/pages/taskmanager/components/task-detail/comment/List.tsx
+++ b/src/pages/taskmanager/components/task-detail/comment/List.tsx
@@ -17,9 +17,10 @@ const CommentList: FC<Props> = ({ taskId, enabled = true }) => {
   const createComment = useCreateTaskComment();
 
   const comments = getComments.data?.data ?? [];
+  const trimmedContent = content.trim();
+  const isSubmitDisabled = createComment.isPending || trimmedContent.length === 0;
 
   const handleSubmit = () => {
-    const trimmedContent = content.trim();
     if (!trimmedContent) return;
 
     createComment.mutate(
@@ -44,7 +45,7 @@ const CommentList: FC<Props> = ({ taskId, enabled = true }) => {
         <button
           type="button"
           onClick={handleSubmit}
-          disabled={createComment.isPending || !content.trim()}
+          disabled={isSubmitDisabled}
           className="absolute top-2 left-2 z-10 h-7 px-2.5 rounded-lg bg-[#292D32] text-white text-[11px] disabled:opacity-50"
         >
           {t("taskmanager.task_detail.add_comment")}