diff --git a/pkg/hostman/guestman/guesttasks.go b/pkg/hostman/guestman/guesttasks.go
index 704446750b..56d67f629b 100644
--- a/pkg/hostman/guestman/guesttasks.go
+++ b/pkg/hostman/guestman/guesttasks.go
@@ -2474,7 +2474,7 @@ func (task *SGuestHotplugCpuMemTask) Start() {
 }
 
 func (task *SGuestHotplugCpuMemTask) startAddCpu() {
-	if task.Desc.MemDesc.Mem.Cpus != nil && len(task.Desc.CpuNumaPin) > 0 {
+	if task.Desc.MemDesc.Mem != nil && task.Desc.MemDesc.Mem.Cpus != nil && len(task.Desc.CpuNumaPin) > 0 {
 		task.buildVcpusMap()
 	} else {
 		task.Monitor.GetCpuCount(task.onGetCpuCount)