diff --git a/backend/app/services/scheduler.py b/backend/app/services/scheduler.py
index 9f596d0..d54b115 100644
--- a/backend/app/services/scheduler.py
+++ b/backend/app/services/scheduler.py
@@ -72,8 +72,9 @@ def _check_upstream(upstream_id: int) -> None:
                             balance = raw_balance / divisor
                     except Exception as exc:
                         logger.warning("upstream %s balance fetch failed: %s", upstream.name, exc)
-                upstream.balance = balance
-                upstream.balance_updated_at = datetime.now(timezone.utc) if balance is not None else None
+                if balance is not None:
+                    upstream.balance = balance
+                    upstream.balance_updated_at = datetime.now(timezone.utc)
             except Exception as exc:
                 # failure path
                 upstream.consecutive_failures = (upstream.consecutive_failures or 0) + 1
diff --git a/frontend/src/views/Upstreams.vue b/frontend/src/views/Upstreams.vue
index bc97dcd..a668448 100644
--- a/frontend/src/views/Upstreams.vue
+++ b/frontend/src/views/Upstreams.vue
@@ -551,6 +551,7 @@ function handlePlatformChange(val: string) {
     form.value.auth_config.username_field = 'email'
     form.value.balance_endpoint = '/auth/me'
     form.value.balance_response_path = 'data.balance'
+    form.value.balance_divisor = 1.0
   } else if (val === 'new-api') {
     form.value.api_prefix = ''
     form.value.groups_endpoint = '/api/group/'
@@ -572,6 +573,7 @@ function handlePlatformChange(val: string) {
   } else {
     form.value.balance_endpoint = ''
     form.value.balance_response_path = ''
+    form.value.balance_divisor = 1.0
   }
 }