diff --git a/EmulatorPkg/CpuRuntimeDxe/MpService.c b/EmulatorPkg/CpuRuntimeDxe/MpService.c
index 866028b4c2..5ddd4e761e 100644
--- a/EmulatorPkg/CpuRuntimeDxe/MpService.c
+++ b/EmulatorPkg/CpuRuntimeDxe/MpService.c
@@ -465,7 +465,13 @@ CpuMpServicesStartupAllAps (
         continue;
       }
 
-      SetApProcedure (ProcessorData, Procedure, ProcedureArgument);
+      gThread->MutexLock (ProcessorData->StateLock);
+      ProcessorState = ProcessorData->State;
+      gThread->MutexUnlock (ProcessorData->StateLock);
+
+      if (ProcessorState == CPU_STATE_READY) {
+        SetApProcedure (ProcessorData, Procedure, ProcedureArgument);
+      }
     }
 
     //