diff --git a/sys/dev/usb/usb_hub.c b/sys/dev/usb/usb_hub.c
index 3cf72ab7845e6e8204dae75b7b4da90aaebbb65f..2d5e9e5c4fed80424280c61deead1142904267c3 100644
--- a/sys/dev/usb/usb_hub.c
+++ b/sys/dev/usb/usb_hub.c
@@ -2891,6 +2891,10 @@ repeat:
 		}
 	}
 
+	/* be NULL safe */
+	if (udev->bus == NULL)
+		return;
+
 	USB_BUS_LOCK(udev->bus);
 	/*
 	 * Checking for suspend condition and setting suspended bit