diff --git a/static/js/chat.js b/static/js/chat.js
index 41d511e..7b72c7d 100644
--- a/static/js/chat.js
+++ b/static/js/chat.js
@@ -13,7 +13,8 @@ function flushDraft(){
     if(draftTimer !== null){ clearTimeout(draftTimer); draftTimer = null; }
     const saved = drafts.write(currentConvId, inputDom.value);
     drafts.active(currentConvId);
-    if(!saved && inputDom.value && !composerStatus.textContent) setComposerStatus(t('draftSaveFailed'), true);
+    if(!saved && inputDom.value && !composerStatus.classList.contains('is-error')) setComposerStatus(t('draftSaveFailed'), true);
+    else if(saved && composerStatus.textContent === t('draftSaveFailed')) setComposerStatus('');
 }
 function restoreDraft(){
     inputDom.value = drafts.read(currentConvId);
diff --git a/tests/frontend/chat.test.cjs b/tests/frontend/chat.test.cjs
index 3fa32c2..8a062d4 100644
--- a/tests/frontend/chat.test.cjs
+++ b/tests/frontend/chat.test.cjs
@@ -926,6 +926,21 @@ test('a new conversation draft restores after refresh and moves to the created c
     assert.equal(store.read(null),'');assert.equal(store.read(1),'');assert.equal(store.active(),'1');
 });
 
+test('quota failure replaces a restored-draft notice and clears after storage recovers', async () => {
+    const history=[{id:9,title:'A',ctime:'now'}],app=await customerPage({human:false,history});
+    await app.click(app.element('historyWrap').children[0]);
+    app.element('input-text').value='已保存草稿';app.element('input-text').listeners.input();await app.pageHide();
+    const restored=await customerPage({human:false,history,storage:app.storage,tabStorage:app.tabStorage});
+    assert.match(restored.element('composer-status').textContent,/已恢复/);
+    const setItem=restored.context.localStorage.setItem;
+    restored.context.localStorage.setItem=()=>{throw Error('quota');};
+    restored.element('input-text').value='新的未保存输入';restored.element('input-text').listeners.input();await restored.runTimers(250);
+    assert.match(restored.element('composer-status').textContent,/无法保存/);
+    assert.equal(restored.element('input-text').value,'新的未保存输入');
+    restored.context.localStorage.setItem=setItem;await restored.pageHide();
+    assert.equal(restored.element('composer-status').textContent,'');
+});
+
 test('restoring an old conversation cannot replace a newer user-selected draft', async () => {
     const app=await customerPage({human:false,history:[{id:9,title:'A',ctime:'now'}]});
     await app.click(app.element('historyWrap').children[0]);