diff --git a/models/issues/issue_project.go b/models/issues/issue_project.go
index ed249527bf7c1..a87e8213683f1 100644
--- a/models/issues/issue_project.go
+++ b/models/issues/issue_project.go
@@ -100,8 +100,8 @@ func LoadIssuesFromBoardList(ctx context.Context, bs project_model.BoardList) (m
 }
 
 // ChangeProjectAssign changes the project associated with an issue
-func ChangeProjectAssign(issue *Issue, doer *user_model.User, newProjectID int64) error {
-	ctx, committer, err := db.TxContext(db.DefaultContext)
+func ChangeProjectAssign(ctx context.Context, issue *Issue, doer *user_model.User, newProjectID int64) error {
+	ctx, committer, err := db.TxContext(ctx)
 	if err != nil {
 		return err
 	}
diff --git a/routers/api/v1/repo/issue.go b/routers/api/v1/repo/issue.go
index 9c74370e1023a..fe9a491603277 100644
--- a/routers/api/v1/repo/issue.go
+++ b/routers/api/v1/repo/issue.go
@@ -707,7 +707,7 @@ func CreateIssue(ctx *context.APIContext) {
 		form.Labels = make([]int64, 0)
 	}
 
-	if err := issue_service.NewIssue(ctx, ctx.Repo.Repository, issue, form.Labels, nil, assigneeIDs); err != nil {
+	if err := issue_service.NewIssue(ctx, ctx.Repo.Repository, issue, form.Labels, nil, assigneeIDs, 0); err != nil {
 		if repo_model.IsErrUserDoesNotHaveAccessToRepo(err) {
 			ctx.Error(http.StatusBadRequest, "UserDoesNotHaveAccessToRepo", err)
 			return
diff --git a/routers/web/org/projects.go b/routers/web/org/projects.go
index 19d3682f51853..439fdf644bb6a 100644
--- a/routers/web/org/projects.go
+++ b/routers/web/org/projects.go
@@ -468,7 +468,7 @@ func UpdateIssueProject(ctx *context.Context) {
 			}
 		}
 
-		if err := issues_model.ChangeProjectAssign(issue, ctx.Doer, projectID); err != nil {
+		if err := issues_model.ChangeProjectAssign(ctx, issue, ctx.Doer, projectID); err != nil {
 			ctx.ServerError("ChangeProjectAssign", err)
 			return
 		}
diff --git a/routers/web/repo/issue.go b/routers/web/repo/issue.go
index 996cffc1f59c0..4d70b485fe1b8 100644
--- a/routers/web/repo/issue.go
+++ b/routers/web/repo/issue.go
@@ -1182,6 +1182,14 @@ func NewIssuePost(ctx *context.Context) {
 		return
 	}
 
+	if projectID > 0 {
+		if !ctx.Repo.CanRead(unit.TypeProjects) {
+			// User must also be able to see the project.
+			ctx.Error(http.StatusBadRequest, "user hasn't permissions to read projects")
+			return
+		}
+	}
+
 	if setting.Attachment.Enabled {
 		attachments = form.Files
 	}
@@ -1214,7 +1222,7 @@ func NewIssuePost(ctx *context.Context) {
 		Ref:         form.Ref,
 	}
 
-	if err := issue_service.NewIssue(ctx, repo, issue, labelIDs, attachments, assigneeIDs); err != nil {
+	if err := issue_service.NewIssue(ctx, repo, issue, labelIDs, attachments, assigneeIDs, projectID); err != nil {
 		if repo_model.IsErrUserDoesNotHaveAccessToRepo(err) {
 			ctx.Error(http.StatusBadRequest, "UserDoesNotHaveAccessToRepo", err.Error())
 			return
@@ -1223,18 +1231,6 @@ func NewIssuePost(ctx *context.Context) {
 		return
 	}
 
-	if projectID > 0 {
-		if !ctx.Repo.CanRead(unit.TypeProjects) {
-			// User must also be able to see the project.
-			ctx.Error(http.StatusBadRequest, "user hasn't permissions to read projects")
-			return
-		}
-		if err := issues_model.ChangeProjectAssign(issue, ctx.Doer, projectID); err != nil {
-			ctx.ServerError("ChangeProjectAssign", err)
-			return
-		}
-	}
-
 	log.Trace("Issue created: %d/%d", repo.ID, issue.ID)
 	if ctx.FormString("redirect_after_creation") == "project" && projectID > 0 {
 		ctx.JSONRedirect(ctx.Repo.RepoLink + "/projects/" + strconv.FormatInt(projectID, 10))
diff --git a/routers/web/repo/projects.go b/routers/web/repo/projects.go
index 09d9c1148d885..692fc4acfb9e2 100644
--- a/routers/web/repo/projects.go
+++ b/routers/web/repo/projects.go
@@ -396,7 +396,7 @@ func UpdateIssueProject(ctx *context.Context) {
 			}
 		}
 
-		if err := issues_model.ChangeProjectAssign(issue, ctx.Doer, projectID); err != nil {
+		if err := issues_model.ChangeProjectAssign(ctx, issue, ctx.Doer, projectID); err != nil {
 			ctx.ServerError("ChangeProjectAssign", err)
 			return
 		}
diff --git a/routers/web/repo/pull.go b/routers/web/repo/pull.go
index ec28e60fc9b4d..308841b172340 100644
--- a/routers/web/repo/pull.go
+++ b/routers/web/repo/pull.go
@@ -1481,7 +1481,7 @@ func CompareAndPullRequestPost(ctx *context.Context) {
 			ctx.Error(http.StatusBadRequest, "user hasn't the permission to write to projects")
 			return
 		}
-		if err := issues_model.ChangeProjectAssign(pullIssue, ctx.Doer, projectID); err != nil {
+		if err := issues_model.ChangeProjectAssign(ctx, pullIssue, ctx.Doer, projectID); err != nil {
 			ctx.ServerError("ChangeProjectAssign", err)
 			return
 		}
diff --git a/services/issue/issue.go b/services/issue/issue.go
index 04e12e2c99745..8a08baf2ba4ab 100644
--- a/services/issue/issue.go
+++ b/services/issue/issue.go
@@ -21,15 +21,24 @@ import (
 )
 
 // NewIssue creates new issue with labels for repository.
-func NewIssue(ctx context.Context, repo *repo_model.Repository, issue *issues_model.Issue, labelIDs []int64, uuids []string, assigneeIDs []int64) error {
-	if err := issues_model.NewIssue(ctx, repo, issue, labelIDs, uuids); err != nil {
-		return err
-	}
-
-	for _, assigneeID := range assigneeIDs {
-		if _, err := AddAssigneeIfNotAssigned(ctx, issue, issue.Poster, assigneeID, true); err != nil {
+func NewIssue(ctx context.Context, repo *repo_model.Repository, issue *issues_model.Issue, labelIDs []int64, uuids []string, assigneeIDs []int64, projectID int64) error {
+	if err := db.WithTx(ctx, func(ctx context.Context) error {
+		if err := issues_model.NewIssue(ctx, repo, issue, labelIDs, uuids); err != nil {
 			return err
 		}
+		for _, assigneeID := range assigneeIDs {
+			if _, err := AddAssigneeIfNotAssigned(ctx, issue, issue.Poster, assigneeID, true); err != nil {
+				return err
+			}
+		}
+		if projectID > 0 {
+			if err := issues_model.ChangeProjectAssign(ctx, issue, issue.Poster, projectID); err != nil {
+				return err
+			}
+		}
+		return nil
+	}); err != nil {
+		return err
 	}
 
 	mentions, err := issues_model.FindAndUpdateIssueMentions(ctx, issue, issue.Poster, issue.Content)