diff --git a/lib/pdu.c b/lib/pdu.c
index 6fe70db..f9c0bc5 100644
--- a/lib/pdu.c
+++ b/lib/pdu.c
@@ -622,7 +622,7 @@ iscsi_process_pdu(struct iscsi_context *iscsi, struct iscsi_in_pdu *in)
 			return -1;
 		}
 
-		if (is_finished) {
+		if (is_finished && iscsi->waitpdu != NULL) {
 			ISCSI_LIST_REMOVE(&iscsi->waitpdu, pdu);
 			iscsi->drv->free_pdu(iscsi, pdu);
 		}