diff --git a/ai-service-admin/src/api/llm.ts b/ai-service-admin/src/api/llm.ts
index 9f66c08..c7b8089 100644
--- a/ai-service-admin/src/api/llm.ts
+++ b/ai-service-admin/src/api/llm.ts
@@ -62,5 +62,6 @@ export type {
   LLMProvidersResponse,
   LLMUsageTypesResponse,
   LLMConfigUpdateResponse,
-  LLMAllConfigs
+  LLMAllConfigs,
+  LLMUsageType
 }
diff --git a/ai-service-admin/src/views/admin/script-flow/index.vue b/ai-service-admin/src/views/admin/script-flow/index.vue
index 6b73912..56d589e 100644
--- a/ai-service-admin/src/views/admin/script-flow/index.vue
+++ b/ai-service-admin/src/views/admin/script-flow/index.vue
@@ -593,7 +593,7 @@ const handleEdit = async (row: ScriptFlow) => {
         allowed_kb_ids: step.allowed_kb_ids || [],
         preferred_kb_ids: step.preferred_kb_ids || [],
         kb_query_hint: step.kb_query_hint || '',
-        max_kb_calls_per_step: step.max_kb_calls_per_step || null
+        max_kb_calls_per_step: step.max_kb_calls_per_step ?? undefined
       })),
       is_enabled: detail.is_enabled,
       metadata: detail.metadata || {}