diff --git a/client/emv/tlv.c b/client/emv/tlv.c
index 0daedaf47..31b5ea360 100644
--- a/client/emv/tlv.c
+++ b/client/emv/tlv.c
@@ -353,6 +353,9 @@ struct tlvdb *tlvdb_find_path(struct tlvdb *tlvdb, tlv_tag_t tag[]) {
 void tlvdb_add(struct tlvdb *tlvdb, struct tlvdb *other)
 {
 	while (tlvdb->next) {
+		if (tlvdb->next == other)
+			return;
+		
 		tlvdb = tlvdb->next;
 	}