diff --git a/kernel/module.c b/kernel/module.c
index 2a19cd4..b7fe6e8 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1054,6 +1054,12 @@
 {
 	int err;
 
+	if (!module_subsys.kset.subsys) {
+		printk(KERN_ERR "%s: module_subsys not initialized\n",
+		       mod->name);
+		err = -EINVAL;
+		goto out;
+	}
 	memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
 	err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name);
 	if (err)