diff --git a/dlls/win32u/driver.c b/dlls/win32u/driver.c
index eb736de272d..5bae77da5f4 100644
--- a/dlls/win32u/driver.c
+++ b/dlls/win32u/driver.c
@@ -1241,7 +1241,7 @@ void __wine_set_user_driver( const struct user_driver_funcs *funcs, UINT version
     }
 
     driver = malloc( sizeof(*driver) );
-    *driver = *funcs;
+    *driver = funcs ? *funcs : null_user_driver;
 
 #define SET_USER_FUNC(name) \
     do { if (!driver->p##name) driver->p##name = nulldrv_##name; } while(0)