diff --git a/function/data/linuxsuren-bot.json b/function/data/linuxsuren-bot.json
new file mode 100644
index 0000000..765efff
--- /dev/null
+++ b/function/data/linuxsuren-bot.json
@@ -0,0 +1,34 @@
+{
+  "login": "linuxsuren-bot",
+  "id": 39147110,
+  "node_id": "MDQ6VXNlcjM5MTQ3MTEw",
+  "avatar_url": "https://avatars.githubusercontent.com/u/39147110?v=4",
+  "gravatar_id": "",
+  "url": "https://api.github.com/users/linuxsuren-bot",
+  "html_url": "https://github.com/linuxsuren-bot",
+  "followers_url": "https://api.github.com/users/linuxsuren-bot/followers",
+  "following_url": "https://api.github.com/users/linuxsuren-bot/following{/other_user}",
+  "gists_url": "https://api.github.com/users/linuxsuren-bot/gists{/gist_id}",
+  "starred_url": "https://api.github.com/users/linuxsuren-bot/starred{/owner}{/repo}",
+  "subscriptions_url": "https://api.github.com/users/linuxsuren-bot/subscriptions",
+  "organizations_url": "https://api.github.com/users/linuxsuren-bot/orgs",
+  "repos_url": "https://api.github.com/users/linuxsuren-bot/repos",
+  "events_url": "https://api.github.com/users/linuxsuren-bot/events{/privacy}",
+  "received_events_url": "https://api.github.com/users/linuxsuren-bot/received_events",
+  "type": "User",
+  "site_admin": false,
+  "name": "LinuxSuRen-bot",
+  "company": null,
+  "blog": "",
+  "location": null,
+  "email": null,
+  "hireable": null,
+  "bio": null,
+  "twitter_username": null,
+  "public_repos": 35,
+  "public_gists": 0,
+  "followers": 1,
+  "following": 2,
+  "created_at": "2018-05-10T04:38:59Z",
+  "updated_at": "2022-06-15T02:15:00Z"
+}
\ No newline at end of file
diff --git a/function/github.go b/function/github.go
index 864c1d4..7e30765 100644
--- a/function/github.go
+++ b/function/github.go
@@ -139,8 +139,8 @@ func GithubUserLink(id string, bio bool) (link string) {
 	)
 	if data, err = ghRequestAsMap(api); err == nil {
 		link = fmt.Sprintf("[%s](%s)", data["name"], data["html_url"])
-		if bio {
-			link = fmt.Sprintf("%s (%s)", link, data["bio"])
+		if bioText, ok := data["bio"]; ok && bio && bioText != nil {
+			link = fmt.Sprintf("%s (%s)", link, bioText)
 		}
 	}
 	return
diff --git a/function/github_test.go b/function/github_test.go
index ae1e7f7..29ebfb6 100644
--- a/function/github_test.go
+++ b/function/github_test.go
@@ -53,49 +53,63 @@ func TestGithubUserLink(t *testing.T) {
 		bio bool
 	}
 	tests := []struct {
-		name string
-		args args
-		want string
+		name     string
+		mockUser string
+		args     args
+		want     string
 	}{{
-		name: "normal case without bio",
+		name:     "normal case without bio",
+		mockUser: "linuxsuren",
 		args: args{
 			id:  "linuxsuren",
 			bio: false,
 		},
 		want: `[Rick](https://github.com/LinuxSuRen)`,
 	}, {
-		name: "normal case with bio",
+		name:     "normal case with bio",
+		mockUser: "linuxsuren",
 		args: args{
 			id:  "linuxsuren",
 			bio: true,
 		},
 		want: `[Rick](https://github.com/LinuxSuRen) (程序员，业余开源布道者)`,
 	}, {
-		name: "with whitespace",
+		name:     "with whitespace",
+		mockUser: "linuxsuren",
 		args: args{
 			id:  "this is not id",
 			bio: false,
 		},
 		want: "this is not id",
 	}, {
-		name: "has Markdown style link",
+		name:     "has Markdown style link",
+		mockUser: "linuxsuren",
 		args: args{
 			id:  "[name](link)",
 			bio: false,
 		},
 		want: "[name](link)",
 	}, {
-		name: "has Markdown style link, want bio",
+		name:     "has Markdown style link, want bio",
+		mockUser: "linuxsuren",
 		args: args{
 			id:  "[Rick](https://github.com/linuxsuren)",
 			bio: true,
 		},
 		want: `[Rick](https://github.com/LinuxSuRen) (程序员，业余开源布道者)`,
+	}, {
+		name:     "do not have bio",
+		mockUser: "linuxsuren-bot",
+		args: args{
+			id:  "linuxsuren-bot",
+			bio: true,
+		},
+		want: `[LinuxSuRen-bot](https://github.com/linuxsuren-bot)`,
 	}}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			defer gock.Off()
-			mockGitHubUser("linuxsuren")
+			mockGitHubUser(tt.mockUser)
 			assert.Equalf(t, tt.want, GithubUserLink(tt.args.id, tt.args.bio), "GithubUserLink(%v, %v)", tt.args.id, tt.args.bio)
 		})
 	}