diff --git a/drivers/staging/comedi/drivers/dt282x.c b/drivers/staging/comedi/drivers/dt282x.c
index c2a66dcf99fee..6a1222c45d352 100644
--- a/drivers/staging/comedi/drivers/dt282x.c
+++ b/drivers/staging/comedi/drivers/dt282x.c
@@ -483,7 +483,8 @@ static irqreturn_t dt282x_interrupt(int irq, void *d)
 	}
 #endif
 	cfc_handle_events(dev, s);
-	cfc_handle_events(dev, s_ao);
+	if (s_ao)
+		cfc_handle_events(dev, s_ao);
 
 	return IRQ_RETVAL(handled);
 }