diff --git a/src/add-ons/kernel/drivers/network/wlan/iprowifi4965/dev/iwn/if_iwn.c b/src/add-ons/kernel/drivers/network/wlan/iprowifi4965/dev/iwn/if_iwn.c
index 5aaeff8ad3..3179debfec 100644
--- a/src/add-ons/kernel/drivers/network/wlan/iprowifi4965/dev/iwn/if_iwn.c
+++ b/src/add-ons/kernel/drivers/network/wlan/iprowifi4965/dev/iwn/if_iwn.c
@@ -3650,6 +3650,11 @@ iwn_tx_done(struct iwn_softc *sc, struct iwn_rx_desc *desc, int rtsfailcnt,
 		return;
 	}
 
+#ifdef __HAIKU__
+	if (!data->ni || !data->m)
+		return;
+#endif
+
 	KASSERT(data->ni != NULL, ("no node"));
 	KASSERT(data->m != NULL, ("no mbuf"));