diff --git a/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/route/Vm.kt b/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/route/Vm.kt
index 9594a68..5663b2f 100644
--- a/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/route/Vm.kt
+++ b/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/route/Vm.kt
@@ -209,7 +209,7 @@ internal fun ApplicationCall.convertVmApplyResponse(vmApply: VmApply) = CreateVm
     namePrefix = vmApply.namePrefix,
     studentId = convertSimpleUser(vmApply.studentId),
     teacherId = convertSimpleUser(vmApply.teacherId),
-    applicant = convertSimpleUser(vmApply.applicant)!!,
+    applicant = convertSimpleUser(vmApply.applicant) ?: SimpleUser("null", "null"),
     experimentId = vmApply.experimentId,
     studentIdList = vmApply.studentIdList,
     cpu = vmApply.cpu,