diff --git a/modules/config/service/egg.go b/modules/config/service/egg.go
index 3043a939..4c54a099 100644
--- a/modules/config/service/egg.go
+++ b/modules/config/service/egg.go
@@ -43,7 +43,7 @@ func (s *EggService) GetResult(m, f, level uint32) (uint32, bool) {
 	md.Wheref(`male_pet_ids @> ARRAY[?]::integer[]`, m).
 		Wheref(`female_pet_ids @> ARRAY[?]::integer[]`, f).Scan(&pet)
 	if pet != nil {
-		pet.Probs[len(pet.OutputMons)-1] += int32(level)
+		pet.Probs[len(pet.Probs)-1] += int32(level)
 		t, _ := utils.RandomByWeight(pet.OutputMons, pet.Probs)
 		if pet.OutputMons[len(pet.OutputMons)-1] == int32(t) {
 			return uint32(t), true