Index: uspace/lib/usb/src/host/device_keeper.c
===================================================================
--- uspace/lib/usb/src/host/device_keeper.c	(revision 506d3304a9e494319951e89a619b5c1bad221a58)
+++ uspace/lib/usb/src/host/device_keeper.c	(revision 049eb877f0d0f895e826c16311bcf58d26511f0a)
@@ -128,4 +128,6 @@
 		/* recipient is endpoint, value is zero (ENDPOINT_STALL) */
 		if (((data[0] & 0xf) == 1) && ((data[2] | data[3]) == 0)) {
+			link_t *current =
+			    instance->devices[target.address].endpoints.next;
 			while (current !=
 			   &instance->devices[target.address].endpoints)