diff --git a/models/update.go b/models/update.go
index 82369bf63..f3bd6cce1 100644
--- a/models/update.go
+++ b/models/update.go
@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"os/exec"
 	"strings"
+	"time"
 
 	"code.gitea.io/git"
 	"code.gitea.io/gitea/modules/cache"
@@ -119,11 +120,24 @@ func pushUpdateAddTag(repo *Repository, gitRepo *git.Repository, tagName string)
 	if err != nil {
 		return fmt.Errorf("Commit: %v", err)
 	}
-	tagCreatedUnix := commit.Author.When.Unix()
 
-	author, err := GetUserByEmail(commit.Author.Email)
-	if err != nil && !IsErrUserNotExist(err) {
-		return fmt.Errorf("GetUserByEmail: %v", err)
+	sig := tag.Tagger
+	if sig == nil {
+		sig = commit.Author
+	}
+	if sig == nil {
+		sig = commit.Committer
+	}
+
+	var author *User
+	var createdAt = time.Unix(1, 0)
+
+	if sig != nil {
+		author, err = GetUserByEmail(sig.Email)
+		if err != nil && !IsErrUserNotExist(err) {
+			return fmt.Errorf("GetUserByEmail: %v", err)
+		}
+		createdAt = sig.When
 	}
 
 	commitsCount, err := commit.CommitsCount()
@@ -144,7 +158,8 @@ func pushUpdateAddTag(repo *Repository, gitRepo *git.Repository, tagName string)
 			IsDraft:      false,
 			IsPrerelease: false,
 			IsTag:        true,
-			CreatedUnix:  tagCreatedUnix,
+			Created:      createdAt,
+			CreatedUnix:  createdAt.Unix(),
 		}
 		if author != nil {
 			rel.PublisherID = author.ID
@@ -155,7 +170,8 @@ func pushUpdateAddTag(repo *Repository, gitRepo *git.Repository, tagName string)
 		}
 	} else {
 		rel.Sha1 = commit.ID.String()
-		rel.CreatedUnix = tagCreatedUnix
+		rel.Created = createdAt
+		rel.CreatedUnix = createdAt.Unix()
 		rel.NumCommits = commitsCount
 		rel.IsDraft = false
 		if rel.IsTag && author != nil {
diff --git a/models/user.go b/models/user.go
index 337c39efe..4dd2ad8d8 100644
--- a/models/user.go
+++ b/models/user.go
@@ -1193,6 +1193,9 @@ type UserCommit struct {
 
 // ValidateCommitWithEmail check if author's e-mail of commit is corresponding to a user.
 func ValidateCommitWithEmail(c *git.Commit) *User {
+	if c.Author == nil {
+		return nil
+	}
 	u, err := GetUserByEmail(c.Author.Email)
 	if err != nil {
 		return nil
@@ -1211,11 +1214,15 @@ func ValidateCommitsWithEmails(oldCommits *list.List) *list.List {
 	for e != nil {
 		c := e.Value.(*git.Commit)
 
-		if v, ok := emails[c.Author.Email]; !ok {
-			u, _ = GetUserByEmail(c.Author.Email)
-			emails[c.Author.Email] = u
+		if c.Author != nil {
+			if v, ok := emails[c.Author.Email]; !ok {
+				u, _ = GetUserByEmail(c.Author.Email)
+				emails[c.Author.Email] = u
+			} else {
+				u = v
+			}
 		} else {
-			u = v
+			u = nil
 		}
 
 		newCommits.PushBack(UserCommit{
diff --git a/templates/repo/view_list.tmpl b/templates/repo/view_list.tmpl
index 67164753e..7be2183fa 100644
--- a/templates/repo/view_list.tmpl
+++ b/templates/repo/view_list.tmpl
@@ -4,14 +4,16 @@
 			<th class="four wide">
 				{{if .LatestCommitUser}}
 					<img class="ui avatar image img-12" src="{{.LatestCommitUser.RelAvatarLink}}" />
-				  {{if .LatestCommitUser.FullName}}
-					  <a href="{{AppSubUrl}}/{{.LatestCommitUser.Name}}"><strong>{{.LatestCommitUser.FullName}}</strong></a>
-				  {{else}}
-				    <a href="{{AppSubUrl}}/{{.LatestCommitUser.Name}}"><strong>{{.LatestCommit.Author.Name}}</strong></a>
-				  {{end}}
+					{{if .LatestCommitUser.FullName}}
+						<a href="{{AppSubUrl}}/{{.LatestCommitUser.Name}}"><strong>{{.LatestCommitUser.FullName}}</strong></a>
+					{{else}}
+						<a href="{{AppSubUrl}}/{{.LatestCommitUser.Name}}"><strong>{{if .LatestCommit.Author}}{{.LatestCommit.Author.Name}}{{else}}{{.LatestCommitUser.Name}}{{end}}</strong></a>
+					{{end}}
 				{{else}}
-					<img class="ui avatar image img-12" src="{{AvatarLink .LatestCommit.Author.Email}}" />
-					<strong>{{.LatestCommit.Author.Name}}</strong>
+					{{if .LatestCommit.Author}}
+						<img class="ui avatar image img-12" src="{{AvatarLink .LatestCommit.Author.Email}}" />
+						<strong>{{.LatestCommit.Author.Name}}</strong>
+					{{end}}
 				{{end}}
 				<a rel="nofollow" class="ui sha label {{if .LatestCommit.Signature}} isSigned {{if .LatestCommitVerification.Verified }} isVerified {{end}}{{end}}" href="{{.RepoLink}}/commit/{{.LatestCommit.ID}}">
 						{{ShortSha .LatestCommit.ID.String}}
@@ -30,7 +32,7 @@
 			</th>
 			<th class="nine wide">
 			</th>
-			<th class="three wide text grey right age">{{TimeSince .LatestCommit.Author.When $.Lang}}</th>
+			<th class="three wide text grey right age">{{if .LatestCommit.Author}}{{TimeSince .LatestCommit.Author.When $.Lang}}{{end}}</th>
 		</tr>
 	</thead>
 	<tbody>