diff --git a/txpool/pool.go b/txpool/pool.go
index 9d7a7d997..60ec56c38 100644
--- a/txpool/pool.go
+++ b/txpool/pool.go
@@ -568,6 +568,13 @@ func (sc *SendersCache) flush(tx kv.RwTx, byNonce *ByNonce) error {
 		if byNonce.count(binary.BigEndian.Uint64(id)) > 0 {
 			return nil
 		}
+		tx.ForEach(kv.PooledTransaction, nil, func(k, v []byte) error {
+			senderID := binary.BigEndian.Uint64(v[:8])
+			if senderID == binary.BigEndian.Uint64(id) {
+				panic("why?")
+			}
+			return nil
+		})
 		if err := tx.Delete(kv.PooledSenderID, addr, nil); err != nil {
 			return err
 		}