diff --git a/reactos/dll/win32/advapi32/service/scm.c b/reactos/dll/win32/advapi32/service/scm.c
index bb10b4f4a6c..a451184daa1 100644
--- a/reactos/dll/win32/advapi32/service/scm.c
+++ b/reactos/dll/win32/advapi32/service/scm.c
@@ -487,6 +487,12 @@ CloseServiceHandle(SC_HANDLE hSCObject)
 
     TRACE("CloseServiceHandle() called\n");
 
+    if (!hSCObject)
+    {
+        SetLastError(ERROR_INVALID_HANDLE);
+        return FALSE;
+    }
+
     RpcTryExcept
     {
         /* Call to services.exe using RPC */
@@ -1212,6 +1218,19 @@ EnumServicesStatusExA(SC_HANDLE hSCManager,
 
     TRACE("EnumServicesStatusExA() called\n");
 
+    if (InfoLevel != SC_ENUM_PROCESS_INFO)
+    {
+        SetLastError(ERROR_INVALID_LEVEL);
+        return FALSE;
+    }
+
+    if (!hSCManager)
+    {
+        SetLastError(ERROR_INVALID_HANDLE);
+        return FALSE;
+    }
+
+
     RpcTryExcept
     {
         dwError = REnumServicesStatusExA((SC_RPC_HANDLE)hSCManager,