diff --git a/parser.go b/parser.go
index b5003de..486fcdc 100644
--- a/parser.go
+++ b/parser.go
@@ -2,6 +2,7 @@ package pump_parser
 
 import (
 	"errors"
+	"log"
 
 	"github.com/gagliardetto/solana-go"
 	"github.com/shopspring/decimal"
@@ -73,6 +74,10 @@ func (tx *Tx) Parser() error {
 			// unknown program, parser inner instructions
 			innerLength := len(innersMap[i].Instructions)
 			for j := 1; j <= innerLength; {
+				if j <= 0 || j > innerLength {
+					log.Printf("inner instruction index is out if range, block: %d, tx: %s, outerIndex: %d, innerIndex: %d", tx.Block, tx.GetTxHash(), ii, j)
+					break
+				}
 				innerInstr := innersMap[i].Instructions[j-1]
 				innerProgramAccount := accountList[innerInstr.ProgramIDIndex]