diff --git a/src/renderer/src/hooks/useAssistant.ts b/src/renderer/src/hooks/useAssistant.ts
index 02a327c345..9527764f81 100644
--- a/src/renderer/src/hooks/useAssistant.ts
+++ b/src/renderer/src/hooks/useAssistant.ts
@@ -7,10 +7,10 @@ import {
   MODEL_SUPPORTED_REASONING_EFFORT
 } from '@renderer/config/models'
 import { db } from '@renderer/databases'
-import { getDefaultTopic } from '@renderer/services/AssistantService'
+import { getDefaultAssistant, getDefaultTopic } from '@renderer/services/AssistantService'
 import { useAppDispatch, useAppSelector } from '@renderer/store'
 import {
-  addAssistant,
+  addAssistant as _addAssistant,
   addTopic,
   insertAssistant,
   removeAllTopics,
@@ -27,6 +27,7 @@ import {
 import { setDefaultModel, setQuickModel, setTranslateModel } from '@renderer/store/llm'
 import { Assistant, AssistantSettings, Model, ThinkingOption, Topic } from '@renderer/types'
 import { uuid } from '@renderer/utils'
+import { formatErrorMessage } from '@renderer/utils/error'
 import { useCallback, useEffect, useMemo, useRef } from 'react'
 import { useTranslation } from 'react-i18next'
 
@@ -38,10 +39,25 @@ export function useAssistants() {
   const dispatch = useAppDispatch()
   const logger = loggerService.withContext('useAssistants')
 
+  /**
+   * 添加一个新的助手
+   * @param assistant - 要添加的助手对象
+   * @throws {Error} 如果添加助手失败会抛出错误
+   */
+  const addAssistant = (assistant: Assistant) => {
+    try {
+      dispatch(_addAssistant(assistant))
+    } catch (e) {
+      logger.error('Failed to add assistant', e as Error)
+      window.message.error(t('assistants.error.add' + ': ' + formatErrorMessage(e)))
+      throw e
+    }
+  }
+
   return {
     assistants,
     updateAssistants: (assistants: Assistant[]) => dispatch(updateAssistants(assistants)),
-    addAssistant: (assistant: Assistant) => dispatch(addAssistant(assistant)),
+    addAssistant,
     insertAssistant: (index: number, assistant: Assistant) => dispatch(insertAssistant({ index, assistant })),
     copyAssistant: (assistant: Assistant): Assistant | undefined => {
       if (!assistant) {
@@ -52,7 +68,7 @@ export function useAssistants() {
       const _assistant: Assistant = { ...assistant, id: uuid(), topics: [getDefaultTopic(assistant.id)] }
       if (index === -1) {
         logger.warn("Origin assistant's id not found. Fallback to addAssistant.")
-        dispatch(addAssistant(_assistant))
+        addAssistant(_assistant)
       } else {
         // 插入到后面
         try {
@@ -74,7 +90,22 @@ export function useAssistants() {
 }
 
 export function useAssistant(id: string) {
-  const assistant = useAppSelector((state) => state.assistants.assistants.find((a) => a.id === id) as Assistant)
+  let assistant = useAppSelector((state) => state.assistants.assistants.find((a) => a.id === id))
+  const { addAssistant } = useAssistants()
+  const { t } = useTranslation()
+
+  if (!assistant) {
+    window.message.warning(t('warning.missing_assistant'))
+    const newAssistant = { ...getDefaultAssistant(), id }
+    try {
+      addAssistant(newAssistant)
+      assistant = newAssistant
+    } catch (e) {
+      window.message.warning(t('warning.fallback.deafult_assistant'))
+      assistant = getDefaultAssistant()
+    }
+  }
+
   const dispatch = useAppDispatch()
   const { defaultModel } = useDefaultModel()
 
@@ -88,7 +119,7 @@ export function useAssistant(id: string) {
   const settingsRef = useRef(assistant?.settings)
 
   useEffect(() => {
-    settingsRef.current = assistant.settings
+    settingsRef.current = assistant?.settings
   }, [assistant?.settings])
 
   const updateAssistantSettings = useCallback(
diff --git a/src/renderer/src/i18n/locales/en-us.json b/src/renderer/src/i18n/locales/en-us.json
index 0a6ffbf92f..b440f49282 100644
--- a/src/renderer/src/i18n/locales/en-us.json
+++ b/src/renderer/src/i18n/locales/en-us.json
@@ -148,6 +148,9 @@
     "edit": {
       "title": "Edit Assistant"
     },
+    "error": {
+      "add": "Failed to add assistant"
+    },
     "icon": {
       "type": "Assistant Icon"
     },
@@ -3787,6 +3790,10 @@
     "title": "Update"
   },
   "warning": {
+    "fallback": {
+      "deafult_assistant": "Reverted to default assistant, which may cause issues"
+    },
+    "missing_assistant": "Assistant does not exist",
     "missing_provider": "The supplier does not exist; reverted to the default supplier {{provider}}. This may cause issues."
   },
   "words": {
diff --git a/src/renderer/src/i18n/locales/ja-jp.json b/src/renderer/src/i18n/locales/ja-jp.json
index f35e31231a..1b68659cf5 100644
--- a/src/renderer/src/i18n/locales/ja-jp.json
+++ b/src/renderer/src/i18n/locales/ja-jp.json
@@ -148,6 +148,9 @@
     "edit": {
       "title": "アシスタントを編集"
     },
+    "error": {
+      "add": "アシスタントの追加に失敗しました"
+    },
     "icon": {
       "type": "アシスタントアイコン"
     },
@@ -3787,6 +3790,10 @@
     "title": "更新"
   },
   "warning": {
+    "fallback": {
+      "deafult_assistant": "既定のアシスタントに戻されました。これにより問題が発生する可能性があります。"
+    },
+    "missing_assistant": "アシスタントが存在しません",
     "missing_provider": "サプライヤーが存在しないため、デフォルトのサプライヤー {{provider}} にロールバックされました。これにより問題が発生する可能性があります。"
   },
   "words": {
diff --git a/src/renderer/src/i18n/locales/ru-ru.json b/src/renderer/src/i18n/locales/ru-ru.json
index 69b64ce26f..d2fa9a969a 100644
--- a/src/renderer/src/i18n/locales/ru-ru.json
+++ b/src/renderer/src/i18n/locales/ru-ru.json
@@ -148,6 +148,9 @@
     "edit": {
       "title": "Редактировать ассистента"
     },
+    "error": {
+      "add": "Не удалось добавить помощника"
+    },
     "icon": {
       "type": "Иконка ассистента"
     },
@@ -3787,6 +3790,10 @@
     "title": "Обновление"
   },
   "warning": {
+    "fallback": {
+      "deafult_assistant": "Возвращено к помощнику по умолчанию, что может привести к проблемам"
+    },
+    "missing_assistant": "Ассистент не существует",
     "missing_provider": "Поставщик не существует, возвращение к поставщику по умолчанию {{provider}}. Это может привести к проблемам."
   },
   "words": {
diff --git a/src/renderer/src/i18n/locales/zh-cn.json b/src/renderer/src/i18n/locales/zh-cn.json
index 3164f068ab..816343ea89 100644
--- a/src/renderer/src/i18n/locales/zh-cn.json
+++ b/src/renderer/src/i18n/locales/zh-cn.json
@@ -148,6 +148,9 @@
     "edit": {
       "title": "编辑助手"
     },
+    "error": {
+      "add": "添加助手失败"
+    },
     "icon": {
       "type": "助手图标"
     },
@@ -3787,6 +3790,10 @@
     "title": "更新提示"
   },
   "warning": {
+    "fallback": {
+      "deafult_assistant": "已回退到默认助手，这可能导致问题"
+    },
+    "missing_assistant": "助手不存在",
     "missing_provider": "供应商不存在，已回退到默认供应商 {{provider}}。这可能导致问题。"
   },
   "words": {
diff --git a/src/renderer/src/i18n/locales/zh-tw.json b/src/renderer/src/i18n/locales/zh-tw.json
index df5500fc71..8825bbce7c 100644
--- a/src/renderer/src/i18n/locales/zh-tw.json
+++ b/src/renderer/src/i18n/locales/zh-tw.json
@@ -148,6 +148,9 @@
     "edit": {
       "title": "編輯助手"
     },
+    "error": {
+      "add": "添加助手失敗"
+    },
     "icon": {
       "type": "助手圖示"
     },
@@ -3787,6 +3790,10 @@
     "title": "更新提示"
   },
   "warning": {
+    "fallback": {
+      "deafult_assistant": "已回退到預設助手，這可能導致問題"
+    },
+    "missing_assistant": "助手不存在",
     "missing_provider": "供應商不存在，已回退到預設供應商 {{provider}}。這可能導致問題。"
   },
   "words": {
diff --git a/src/renderer/src/i18n/translate/el-gr.json b/src/renderer/src/i18n/translate/el-gr.json
index 9cbbda52c1..985544229b 100644
--- a/src/renderer/src/i18n/translate/el-gr.json
+++ b/src/renderer/src/i18n/translate/el-gr.json
@@ -148,6 +148,9 @@
     "edit": {
       "title": "Επεξεργασία βοηθού"
     },
+    "error": {
+      "add": "Αποτυχία προσθήκης βοηθού"
+    },
     "icon": {
       "type": "Εικόνα Βοηθού"
     },
@@ -2679,6 +2682,7 @@
         "title": "Αυτόματη ενημέρωση"
       },
       "avatar": {
+        "builtin": "ενσωματωμένο avatar",
         "reset": "Επαναφορά εικονιδίου"
       },
       "backup": {
@@ -3783,6 +3787,10 @@
     "title": "Ενημέρωση"
   },
   "warning": {
+    "fallback": {
+      "deafult_assistant": "Επαναφέρθηκε στον προεπιλεγμένο βοηθό, γεγονός που ενδέχεται να προκαλέσει προβλήματα"
+    },
+    "missing_assistant": "Ο βοηθός δεν υπάρχει",
     "missing_provider": "Ο προμηθευτής δεν υπάρχει, έγινε επαναφορά στον προεπιλεγμένο προμηθευτή {{provider}}. Αυτό μπορεί να προκαλέσει προβλήματα."
   },
   "words": {
diff --git a/src/renderer/src/i18n/translate/es-es.json b/src/renderer/src/i18n/translate/es-es.json
index 25e186c567..d0cd6bd565 100644
--- a/src/renderer/src/i18n/translate/es-es.json
+++ b/src/renderer/src/i18n/translate/es-es.json
@@ -148,6 +148,9 @@
     "edit": {
       "title": "Editar Asistente"
     },
+    "error": {
+      "add": "Error al agregar asistente"
+    },
     "icon": {
       "type": "Ícono del Asistente"
     },
@@ -2679,6 +2682,7 @@
         "title": "Actualización automática"
       },
       "avatar": {
+        "builtin": "Avatares integrados",
         "reset": "Restablecer avatar"
       },
       "backup": {
@@ -3783,6 +3787,10 @@
     "title": "Actualización"
   },
   "warning": {
+    "fallback": {
+      "deafult_assistant": "Se ha revertido al asistente predeterminado, lo que podría causar problemas"
+    },
+    "missing_assistant": "El asistente no existe",
     "missing_provider": "El proveedor no existe, se ha revertido al proveedor predeterminado {{provider}}. Esto podría causar problemas."
   },
   "words": {
diff --git a/src/renderer/src/i18n/translate/fr-fr.json b/src/renderer/src/i18n/translate/fr-fr.json
index 266985c94b..d91c04abe2 100644
--- a/src/renderer/src/i18n/translate/fr-fr.json
+++ b/src/renderer/src/i18n/translate/fr-fr.json
@@ -148,6 +148,9 @@
     "edit": {
       "title": "Modifier l'Aide"
     },
+    "error": {
+      "add": "Échec de l'ajout de l'assistant"
+    },
     "icon": {
       "type": "Icône de l'assistant"
     },
@@ -2679,6 +2682,7 @@
         "title": "Mise à jour automatique"
       },
       "avatar": {
+        "builtin": "Avatar intégré",
         "reset": "Réinitialiser l'avatar"
       },
       "backup": {
@@ -3783,6 +3787,10 @@
     "title": "Mise à jour"
   },
   "warning": {
+    "fallback": {
+      "deafult_assistant": "Revenu à l'assistant par défaut, ce qui pourrait entraîner des problèmes"
+    },
+    "missing_assistant": "L'assistant n'existe pas",
     "missing_provider": "Le fournisseur n’existe pas, retour au fournisseur par défaut {{provider}}. Cela peut entraîner des problèmes."
   },
   "words": {
diff --git a/src/renderer/src/i18n/translate/pt-pt.json b/src/renderer/src/i18n/translate/pt-pt.json
index def1ee8900..b66907dfaa 100644
--- a/src/renderer/src/i18n/translate/pt-pt.json
+++ b/src/renderer/src/i18n/translate/pt-pt.json
@@ -148,6 +148,9 @@
     "edit": {
       "title": "Editar Assistente"
     },
+    "error": {
+      "add": "Falha ao adicionar assistente"
+    },
     "icon": {
       "type": "Ícone do Assistente"
     },
@@ -2679,6 +2682,7 @@
         "title": "Atualização automática"
       },
       "avatar": {
+        "builtin": "Avatares integrados",
         "reset": "Redefinir avatar"
       },
       "backup": {
@@ -3783,6 +3787,10 @@
     "title": "Atualização"
   },
   "warning": {
+    "fallback": {
+      "deafult_assistant": "Voltou ao assistente padrão, o que pode causar problemas"
+    },
+    "missing_assistant": "O assistente não existe",
     "missing_provider": "O fornecedor não existe; foi revertido para o fornecedor predefinido {{provider}}. Isto pode causar problemas."
   },
   "words": {
diff --git a/src/renderer/src/store/assistants.ts b/src/renderer/src/store/assistants.ts
index 15a735bc7f..d6108ff7b4 100644
--- a/src/renderer/src/store/assistants.ts
+++ b/src/renderer/src/store/assistants.ts
@@ -32,7 +32,13 @@ const assistantsSlice = createSlice({
       state.assistants = action.payload
     },
     addAssistant: (state, action: PayloadAction<Assistant>) => {
-      state.assistants.push(action.payload)
+      const newAssistant = action.payload
+      const existing = state.assistants.find((item) => item.id === newAssistant.id)
+      if (!existing) {
+        state.assistants.push(action.payload)
+      } else {
+        throw new Error('Assistant with this ID already exists')
+      }
     },
     insertAssistant: (state, action: PayloadAction<{ index: number; assistant: Assistant }>) => {
       const { index, assistant } = action.payload