diff --git a/src/renderer/src/components/key/KeyDetail.vue b/src/renderer/src/components/key/KeyDetail.vue
index 41002bc..2ba279e 100644
--- a/src/renderer/src/components/key/KeyDetail.vue
+++ b/src/renderer/src/components/key/KeyDetail.vue
@@ -164,7 +164,12 @@ async function refreshKey() {
     </div>
 
     <div class="detail-content">
-      <StringEditor v-if="keyStore.selectedType === 'string'" />
+      <div v-if="keyStore.selectedType === 'none'" class="key-expired">
+        <el-icon size="48" color="var(--text-muted)"><Warning /></el-icon>
+        <p>{{ t('key.keyExpired') }}</p>
+        <el-button type="primary" @click="refreshKey">{{ t('common.refresh') }}</el-button>
+      </div>
+      <StringEditor v-else-if="keyStore.selectedType === 'string'" />
       <HashEditor v-else-if="keyStore.selectedType === 'hash'" />
       <ListEditor v-else-if="keyStore.selectedType === 'list'" />
       <SetEditor v-else-if="keyStore.selectedType === 'set'" />
@@ -303,4 +308,18 @@ async function refreshKey() {
   margin-top: 12px;
   font-size: 13px;
 }
+
+.key-expired {
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  color: var(--text-muted);
+}
+
+.key-expired p {
+  margin: 12px 0 16px;
+  font-size: 13px;
+}
 </style>
diff --git a/src/renderer/src/i18n/locales/de.ts b/src/renderer/src/i18n/locales/de.ts
index e14fe97..265e059 100644
--- a/src/renderer/src/i18n/locales/de.ts
+++ b/src/renderer/src/i18n/locales/de.ts
@@ -101,6 +101,7 @@ export default {
     andMore: '...und {n} weitere',
     selected: '{n} ausgewählt',
     selectKey: 'Wählen Sie einen Schlüssel für Details',
+    keyExpired: 'Dieser Schlüssel existiert nicht mehr (möglicherweise abgelaufen oder gelöscht)',
     unsupported: 'Typ "{type}"-Anzeige noch nicht implementiert',
     patternPlaceholder: 'Schlüssel scannen (z.B. user:*, * ? unterstützt)',
     scanHint: 'Schlüssel auf dem Redis-Server scannen. * passt zu beliebigen Zeichen, ? zu einem einzelnen Zeichen. Enter zum Scannen.',
diff --git a/src/renderer/src/i18n/locales/en.ts b/src/renderer/src/i18n/locales/en.ts
index 17a321f..b4224d0 100644
--- a/src/renderer/src/i18n/locales/en.ts
+++ b/src/renderer/src/i18n/locales/en.ts
@@ -101,6 +101,7 @@ export default {
     andMore: '...and {n} more',
     selected: '{n} selected',
     selectKey: 'Select a key to view details',
+    keyExpired: 'This key no longer exists (may have expired or been deleted)',
     unsupported: 'Type "{type}" viewer not yet implemented',
     patternPlaceholder: 'Scan keys (e.g. user:*, supports * ?)',
     scanHint: 'Scan keys on Redis server. * matches any characters, ? matches a single character. Press Enter to scan.',
diff --git a/src/renderer/src/i18n/locales/ja.ts b/src/renderer/src/i18n/locales/ja.ts
index 8206aa0..c929fdb 100644
--- a/src/renderer/src/i18n/locales/ja.ts
+++ b/src/renderer/src/i18n/locales/ja.ts
@@ -101,6 +101,7 @@ export default {
     andMore: '...他 {n} 個',
     selected: '{n} 個選択済み',
     selectKey: 'キーを選択して詳細を表示',
+    keyExpired: 'このキーは存在しません（期限切れまたは削除された可能性があります）',
     unsupported: 'タイプ "{type}" のビューアーは未実装です',
     patternPlaceholder: 'キーをスキャン (例: user:*, * ? 対応)',
     scanHint: 'Redisサーバーでキーをスキャン。* は任意の文字列、? は1文字に一致。Enterでスキャン。',
diff --git a/src/renderer/src/i18n/locales/ko.ts b/src/renderer/src/i18n/locales/ko.ts
index 43a5847..4e19b1a 100644
--- a/src/renderer/src/i18n/locales/ko.ts
+++ b/src/renderer/src/i18n/locales/ko.ts
@@ -101,6 +101,7 @@ export default {
     andMore: '...그 외 {n}개',
     selected: '{n}개 선택됨',
     selectKey: '키를 선택하여 세부 정보 보기',
+    keyExpired: '이 키는 더 이상 존재하지 않습니다(만료되었거나 삭제되었을 수 있음)',
     unsupported: '"{type}" 유형 뷰어가 아직 구현되지 않았습니다',
     patternPlaceholder: '키 스캔 (예: user:*, * ? 지원)',
     scanHint: 'Redis 서버에서 키를 스캔합니다. * 는 임의의 문자, ? 는 단일 문자와 일치. Enter로 스캔.',
diff --git a/src/renderer/src/i18n/locales/zh-CN.ts b/src/renderer/src/i18n/locales/zh-CN.ts
index ac45b30..26bd5c4 100644
--- a/src/renderer/src/i18n/locales/zh-CN.ts
+++ b/src/renderer/src/i18n/locales/zh-CN.ts
@@ -101,6 +101,7 @@ export default {
     andMore: '...以及其他 {n} 个',
     selected: '已选 {n} 项',
     selectKey: '选择一个键查看详情',
+    keyExpired: '该键已不存在（可能已过期或被删除）',
     unsupported: '类型 "{type}" 查看器尚未实现',
     patternPlaceholder: '扫描 Key (如 user:*, 支持 * ?)',
     scanHint: '在 Redis 服务端按模式扫描 Key。* 匹配任意字符, ? 匹配单个字符。回车扫描。',
diff --git a/src/renderer/src/stores/key.ts b/src/renderer/src/stores/key.ts
index 80288a0..c97dcfc 100644
--- a/src/renderer/src/stores/key.ts
+++ b/src/renderer/src/stores/key.ts
@@ -138,6 +138,21 @@ export const useKeyStore = defineStore('key', () => {
       await loadKeyTypeAndTTL(connId, key)
       selectedKey.value = key
 
+      // Key no longer exists — show expired state and refresh list
+      if (selectedType.value === 'none') {
+        keyData.value = null
+        // Remove the stale key from the list
+        keys.value = keys.value.filter(k => k.name !== key)
+        // Rebuild tree if needed
+        if (useTree.value) {
+          const conn = (await window.electronAPI.storage.getConnections())
+            .find((c: any) => c.id === connId)
+          const sep = conn?.separator || ':'
+          treeKeys.value = buildTree(keys.value.map(k => k.name), sep)
+        }
+        return
+      }
+
       try {
         switch (selectedType.value) {
           case 'string':