diff --git a/api/controllers/console/workspace/workspace.py b/api/controllers/console/workspace/workspace.py
index cd72872b6..7a11a45ae 100644
--- a/api/controllers/console/workspace/workspace.py
+++ b/api/controllers/console/workspace/workspace.py
@@ -161,13 +161,13 @@ class CustomConfigWorkspaceApi(Resource):
         parser.add_argument('replace_webapp_logo', type=str,  location='json')
         args = parser.parse_args()
 
+        tenant = db.session.query(Tenant).filter(Tenant.id == current_user.current_tenant_id).one_or_404()
+
         custom_config_dict = {
             'remove_webapp_brand': args['remove_webapp_brand'],
-            'replace_webapp_logo': args['replace_webapp_logo'],
+            'replace_webapp_logo': args['replace_webapp_logo'] if args['replace_webapp_logo'] is not None else tenant.custom_config_dict.get('replace_webapp_logo') ,
         }
 
-        tenant = db.session.query(Tenant).filter(Tenant.id == current_user.current_tenant_id).one_or_404()
-
         tenant.custom_config_dict = custom_config_dict
         db.session.commit()
 
diff --git a/web/app/components/base/chat/chat-with-history/config-panel/index.tsx b/web/app/components/base/chat/chat-with-history/config-panel/index.tsx
index f49dcbab0..649aa5037 100644
--- a/web/app/components/base/chat/chat-with-history/config-panel/index.tsx
+++ b/web/app/components/base/chat/chat-with-history/config-panel/index.tsx
@@ -146,14 +146,14 @@ const ConfigPanel = () => {
                 ? null
                 : (
                   <div className={`flex items-center justify-end ${isMobile && 'w-full'}`}>
-                    <a className='flex items-center pr-3 space-x-3' href="https://dify.ai/" target="_blank">
+                    <div className='flex items-center pr-3 space-x-3'>
                       <span className='uppercase'>{t('share.chat.powerBy')}</span>
                       {
                         customConfig?.replace_webapp_logo
                           ? <img src={customConfig?.replace_webapp_logo} alt='logo' className='block w-auto h-5' />
                           : <FootLogo />
                       }
-                    </a>
+                    </div>
                   </div>
                 )
             }
diff --git a/web/app/components/custom/custom-web-app-brand/index.tsx b/web/app/components/custom/custom-web-app-brand/index.tsx
index 857706bf2..71b18909a 100644
--- a/web/app/components/custom/custom-web-app-brand/index.tsx
+++ b/web/app/components/custom/custom-web-app-brand/index.tsx
@@ -29,6 +29,7 @@ const CustomWebAppBrand = () => {
     isCurrentWorkspaceManager,
   } = useAppContext()
   const [fileId, setFileId] = useState('')
+  const [imgKey, setImgKey] = useState(Date.now())
   const [uploadProgress, setUploadProgress] = useState(0)
   const isSandbox = enableBilling && plan.type === Plan.sandbox
   const uploading = uploadProgress > 0 && uploadProgress < 100
@@ -73,6 +74,7 @@ const CustomWebAppBrand = () => {
     })
     mutateCurrentWorkspace()
     setFileId('')
+    setImgKey(Date.now())
   }
 
   const handleRestore = async () => {
@@ -80,7 +82,7 @@ const CustomWebAppBrand = () => {
       url: '/workspaces/custom-config',
       body: {
         remove_webapp_brand: false,
-        replace_webapp_logo: null,
+        replace_webapp_logo: '',
       },
     })
     mutateCurrentWorkspace()
@@ -91,7 +93,6 @@ const CustomWebAppBrand = () => {
       url: '/workspaces/custom-config',
       body: {
         remove_webapp_brand: checked,
-        replace_webapp_logo: webappLogo,
       },
     })
     mutateCurrentWorkspace()
@@ -121,7 +122,7 @@ const CustomWebAppBrand = () => {
                 POWERED BY
                 {
                   webappLogo
-                    ? <img key={webappLogo} src={webappLogo} alt='logo' className='ml-2 block w-auto h-5' />
+                    ? <img src={`${webappLogo}?hash=${imgKey}`} alt='logo' className='ml-2 block w-auto h-5' />
                     : <LogoSite className='ml-2 !h-5' />
                 }
               </div>