diff --git a/src/main/kotlin/cn/fadinglight/libs/Response.kt b/src/main/kotlin/cn/fadinglight/libs/Response.kt
index d3f510a..b54f13a 100644
--- a/src/main/kotlin/cn/fadinglight/libs/Response.kt
+++ b/src/main/kotlin/cn/fadinglight/libs/Response.kt
@@ -12,7 +12,7 @@ sealed class Resp<T> {
         override fun json() = RespData(code = 0, data = data, message = null)
     }
 
-    class Error(private val message: String?, val code: Int) : Resp<Unit>() {
+    class Error(private val message: String?, val code: Int=-1) : Resp<Unit>() {
         override fun json(): RespData<Unit> = RespData(code = code, data = null, message = message)
     }
 
diff --git a/src/main/kotlin/cn/fadinglight/models/Bill.kt b/src/main/kotlin/cn/fadinglight/models/Bill.kt
index 5e22316..c72bdac 100644
--- a/src/main/kotlin/cn/fadinglight/models/Bill.kt
+++ b/src/main/kotlin/cn/fadinglight/models/Bill.kt
@@ -4,9 +4,18 @@ import kotlinx.serialization.Serializable
 
 
 enum class BillType {
-    Consume,
-    Income,
+    CONSUME,
+    INCOME;
+
+    companion object {
+        fun toType(n: Int): BillType = when (n) {
+            0 -> CONSUME
+            1 -> INCOME
+            else -> throw IllegalArgumentException("error type $n")
+        }
+    }
 }
+
 @Serializable
 data class Bill(
     var id: Int?,
diff --git a/src/main/kotlin/cn/fadinglight/routes/BillRoutes.kt b/src/main/kotlin/cn/fadinglight/routes/BillRoutes.kt
index 978c672..799b760 100644
--- a/src/main/kotlin/cn/fadinglight/routes/BillRoutes.kt
+++ b/src/main/kotlin/cn/fadinglight/routes/BillRoutes.kt
@@ -41,10 +41,15 @@ fun Route.billRoute() {
             }
         }
 
-        delete("{id}") {
-            val id = call.parameters.getOrFail("id").toInt()
-            val count = billService.deleteOneBill(id)
-            call.respond(status = HttpStatusCode.OK, Resp.Ok(count).json())
+        delete("{id?}") {
+            runCatching {
+                val id = call.parameters.getOrFail("id").toInt()
+                billService.deleteOneBill(id)
+            }.onSuccess {
+                call.respond(status = HttpStatusCode.OK, Resp.Ok(it).json())
+            }.onFailure {
+                call.respond(Resp.Error(it.message).json())
+            }
         }
 
         put("/") {
diff --git a/src/main/kotlin/cn/fadinglight/vo/BillVO.kt b/src/main/kotlin/cn/fadinglight/vo/BillVO.kt
index c8b0347..f1ce56c 100644
--- a/src/main/kotlin/cn/fadinglight/vo/BillVO.kt
+++ b/src/main/kotlin/cn/fadinglight/vo/BillVO.kt
@@ -3,6 +3,7 @@ package cn.fadinglight.vo
 import cn.fadinglight.models.Bill
 import cn.fadinglight.models.BillType
 import kotlinx.serialization.Serializable
+import java.util.*
 
 @Serializable
 data class BillVO(
@@ -17,7 +18,7 @@ data class BillVO(
 
 fun BillVO.bill() = Bill(
     id = id,
-    type = BillType.valueOf(type),
+    type = BillType.valueOf(type.uppercase(Locale.getDefault())),
     date = date,
     money = money,
     cls = cls,