diff --git a/lib/scsi-lowlevel.c b/lib/scsi-lowlevel.c
index 1b498530..0ced6a22 100644
--- a/lib/scsi-lowlevel.c
+++ b/lib/scsi-lowlevel.c
@@ -80,6 +80,8 @@ scsi_free_scsi_task(struct scsi_task *task)
 
 	free(task->datain.data);
 	free(task);
+	task->datain.data = NULL;
+	task = NULL;
 }
 
 struct scsi_task *