diff --git a/core/tx_pool.go b/core/tx_pool.go
index 791638575e..e54ea9f8c6 100644
--- a/core/tx_pool.go
+++ b/core/tx_pool.go
@@ -856,6 +856,7 @@ func (pool *TxPool) addTxs(txs []*types.Transaction, local, sync bool) []error {
 			nilSlot++
 		}
 		errs[nilSlot] = err
+		nilSlot++
 	}
 	log.Trace("Filtered transactions with errors", "count", len(errs))
 	// Reorg the pool internals if needed and return