diff --git a/reactos/dll/win32/advapi32/reg/reg.c b/reactos/dll/win32/advapi32/reg/reg.c
index 61ecd6b870a..82489ec9591 100644
--- a/reactos/dll/win32/advapi32/reg/reg.c
+++ b/reactos/dll/win32/advapi32/reg/reg.c
@@ -3338,6 +3338,10 @@ RegOpenKeyExA(HKEY hKey,
 
     TRACE("RegOpenKeyExA hKey 0x%x lpSubKey %s ulOptions 0x%x samDesired 0x%x phkResult %p\n",
           hKey, lpSubKey, ulOptions, samDesired, phkResult);
+	if (!phkResult)
+    {
+        return ERROR_INVALID_PARAMETER;
+    }
 
     Status = MapDefaultKey(&KeyHandle,
                            hKey);
@@ -3389,6 +3393,10 @@ RegOpenKeyExW(HKEY hKey,
 
     TRACE("RegOpenKeyExW hKey 0x%x lpSubKey %S ulOptions 0x%x samDesired 0x%x phkResult %p\n",
           hKey, lpSubKey, ulOptions, samDesired, phkResult);
+	if (!phkResult)
+    {
+        return ERROR_INVALID_PARAMETER;
+    }
 
     Status = MapDefaultKey(&KeyHandle, hKey);
     if (!NT_SUCCESS(Status))
@@ -4265,7 +4273,10 @@ RegQueryValueW(HKEY hKey,
 
     TRACE("hKey 0x%X lpSubKey %S lpValue %p lpcbValue %d\n",
           hKey, lpSubKey, lpValue, lpcbValue ? *lpcbValue : 0);
-
+   if (hKey == NULL)
+	{
+		return ERROR_INVALID_HANDLE;
+	}
     Status = MapDefaultKey(&KeyHandle,
                            hKey);
     if (!NT_SUCCESS(Status))