diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e21cef..d6ad308 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.0.7](https://github.com/kudoas/sync-issue-field/compare/v0.0.6...v0.0.7) (2024-04-21)
+
+
+### Bug Fixes
+
+* use return early ([#19](https://github.com/kudoas/sync-issue-field/issues/19)) ([282d275](https://github.com/kudoas/sync-issue-field/commit/282d275d997b06fe4a0b2e944e27e9cf6f5f2b5b))
+
 ## [0.0.6](https://github.com/kudoas/sync-issue-field/compare/v0.0.5...v0.0.6) (2024-04-21)
 
 
diff --git a/action.yml b/action.yml
index 9d95836..c4744be 100644
--- a/action.yml
+++ b/action.yml
@@ -1,12 +1,12 @@
-name: "Sync GitHub Issue"
-description: "Sync GitHub Parent Issue to Child Issue"
+name: "Sync Issue Field"
+description: "Sync GitHub parent issue's fields to child issue's fields."
 author: "kudoas"
 inputs:
   repository:
-    description: "Repository name with owner. For example, kudoas/gis'"
+    description: "Repository name with owner. For example, kudoas/sync-issue-field. Default is the current repository."
     default: ${{ github.repository }}
   issue:
-    description: "The number that identifies the issue. Specify the child issue you wish to synchronize with the parent issue"
+    description: "The number that identifies the issue. Specify the child issue you wish to synchronize with the parent issue. Default is the current issue."
     default: ${{ github.event.issue.number }}
   token:
     description: "GitHub Token"
diff --git a/main.go b/main.go
index 4361eb3..31e841b 100644
--- a/main.go
+++ b/main.go
@@ -43,6 +43,7 @@ func main() {
 	}); err != nil {
 		log.Fatalf("failed to get parent issue: %v", err)
 	}
+
 	mi := mutate.NewMutationIssue()
 	input := githubv4.UpdateIssueInput{
 		ID:          i.GetIssueID(),
@@ -53,7 +54,12 @@ func main() {
 	if err := mi.Mutate(client, context.Background(), input); err != nil {
 		log.Fatalf("failed to update issue: %v", err)
 	}
+
 	mp := mutate.NewMutationProject()
+	projectID := p.GetProjectID()
+	if projectID == nil {
+		return
+	}
 	if err := mp.Mutate(client, githubv4.AddProjectV2ItemByIdInput{
 		ProjectID: p.GetProjectID(),
 		ContentID: i.GetIssueID(),
diff --git a/query/issue.go b/query/issue.go
index 13ae0e3..e6dc654 100644
--- a/query/issue.go
+++ b/query/issue.go
@@ -2,7 +2,7 @@ package query
 
 import (
 	"context"
-	"fmt"
+	"log"
 	"os"
 
 	"github.com/shurcooL/githubv4"
@@ -35,6 +35,7 @@ func (i *IssueID) GetIssueID() githubv4.ID {
 
 func (i *IssueID) GetParentIssueID() githubv4.ID {
 	if len(i.Repository.Issue.TrackedInIssues.Nodes) == 0 {
+		log.Println("not found parent issue")
 		os.Exit(0)
 	}
 	return i.Repository.Issue.TrackedInIssues.Nodes[0].ID
@@ -100,9 +101,8 @@ func (p *ParentIssue) GetMilestoneID() *githubv4.ID {
 }
 
 func (p *ParentIssue) GetProjectID() githubv4.ID {
-	println(fmt.Sprintf("%+v", p.Node.Issue.ProjectItems.Nodes))
 	if len(p.Node.Issue.ProjectItems.Nodes) == 0 {
-		os.Exit(0)
+		return nil
 	}
 	return p.Node.Issue.ProjectItems.Nodes[0].Project.ID
 }