diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 4090524..60739d0 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -115,6 +115,8 @@
 {
 	u64 __cookie = cookie;
 
+	if (!extack)
+		return;
 	memcpy(extack->cookie, &__cookie, sizeof(__cookie));
 	extack->cookie_len = sizeof(__cookie);
 }
@@ -124,6 +126,8 @@
 {
 	u32 __cookie = cookie;
 
+	if (!extack)
+		return;
 	memcpy(extack->cookie, &__cookie, sizeof(__cookie));
 	extack->cookie_len = sizeof(__cookie);
 }