diff --git a/conf/locale/locale_en-US.ini b/conf/locale/locale_en-US.ini
index 30a906a5b..2852168d3 100644
--- a/conf/locale/locale_en-US.ini
+++ b/conf/locale/locale_en-US.ini
@@ -139,6 +139,9 @@ repos = Repositories
 users = Users
 organizations = Organizations
 search = Search
+repo_no_results = There are no matched repositories found.
+user_no_results = There are no matched users found.
+org_no_results = There are no matched organizations found.
 
 [auth]
 create_new_account = Create New Account
diff --git a/conf/locale/locale_zh-CN.ini b/conf/locale/locale_zh-CN.ini
index 4809949cf..770e6228d 100644
--- a/conf/locale/locale_zh-CN.ini
+++ b/conf/locale/locale_zh-CN.ini
@@ -139,6 +139,9 @@ repos=仓库
 users=用户
 organizations=组织
 search=搜索
+repo_no_results = 没有匹配的仓库。
+user_no_results = 没有匹配的用户。
+org_no_results = 没有匹配的组织。
 
 [auth]
 create_new_account=创建帐户
diff --git a/routers/home.go b/routers/home.go
index a2faf65bc..3b5114876 100644
--- a/routers/home.go
+++ b/routers/home.go
@@ -9,6 +9,8 @@ import (
 
 	"github.com/Unknwon/paginater"
 
+	"bytes"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
@@ -60,6 +62,14 @@ type RepoSearchOptions struct {
 	TplName  base.TplName
 }
 
+var (
+	nullByte = []byte{0x00}
+)
+
+func isKeywordValid(keyword string) bool {
+	return !bytes.Contains([]byte(keyword), nullByte)
+}
+
 // RenderRepoSearch render repositories search page
 func RenderRepoSearch(ctx *context.Context, opts *RepoSearchOptions) {
 	page := ctx.QueryInt("page")
@@ -82,16 +92,18 @@ func RenderRepoSearch(ctx *context.Context, opts *RepoSearchOptions) {
 		}
 		count = opts.Counter(opts.Private)
 	} else {
-		repos, count, err = models.SearchRepositoryByName(&models.SearchRepoOptions{
-			Keyword:  keyword,
-			OrderBy:  opts.OrderBy,
-			Private:  opts.Private,
-			Page:     page,
-			PageSize: opts.PageSize,
-		})
-		if err != nil {
-			ctx.Handle(500, "SearchRepositoryByName", err)
-			return
+		if isKeywordValid(keyword) {
+			repos, count, err = models.SearchRepositoryByName(&models.SearchRepoOptions{
+				Keyword:  keyword,
+				OrderBy:  opts.OrderBy,
+				Private:  opts.Private,
+				Page:     page,
+				PageSize: opts.PageSize,
+			})
+			if err != nil {
+				ctx.Handle(500, "SearchRepositoryByName", err)
+				return
+			}
 		}
 	}
 	ctx.Data["Keyword"] = keyword
@@ -156,16 +168,18 @@ func RenderUserSearch(ctx *context.Context, opts *UserSearchOptions) {
 		}
 		count = opts.Counter()
 	} else {
-		users, count, err = models.SearchUserByName(&models.SearchUserOptions{
-			Keyword:  keyword,
-			Type:     opts.Type,
-			OrderBy:  opts.OrderBy,
-			Page:     page,
-			PageSize: opts.PageSize,
-		})
-		if err != nil {
-			ctx.Handle(500, "SearchUserByName", err)
-			return
+		if isKeywordValid(keyword) {
+			users, count, err = models.SearchUserByName(&models.SearchUserOptions{
+				Keyword:  keyword,
+				Type:     opts.Type,
+				OrderBy:  opts.OrderBy,
+				Page:     page,
+				PageSize: opts.PageSize,
+			})
+			if err != nil {
+				ctx.Handle(500, "SearchUserByName", err)
+				return
+			}
 		}
 	}
 	ctx.Data["Keyword"] = keyword
diff --git a/templates/explore/organizations.tmpl b/templates/explore/organizations.tmpl
index c44456be4..7044894a0 100644
--- a/templates/explore/organizations.tmpl
+++ b/templates/explore/organizations.tmpl
@@ -24,6 +24,8 @@
 						    </div>
 						  </div>
 						</div>
+					{{else}}
+						<div>{{$.i18n.Tr "explore.org_no_results"}}</div>
 					{{end}}
 				</div>
 
diff --git a/templates/explore/repo_list.tmpl b/templates/explore/repo_list.tmpl
index 2cf7202fd..961e510c0 100644
--- a/templates/explore/repo_list.tmpl
+++ b/templates/explore/repo_list.tmpl
@@ -19,5 +19,9 @@
 			{{if .DescriptionHTML}}<p class="has-emoji">{{.DescriptionHTML}}</p>{{end}}
 			<p class="time">{{$.i18n.Tr "org.repo_updated"}} {{TimeSince .Updated $.i18n.Lang}}</p>
 		</div>
+	{{else}}
+	<div>
+		{{$.i18n.Tr "explore.repo_no_results"}}
+	</div>
 	{{end}}
 </div>
diff --git a/templates/explore/users.tmpl b/templates/explore/users.tmpl
index ce356f4fd..09091df25 100644
--- a/templates/explore/users.tmpl
+++ b/templates/explore/users.tmpl
@@ -24,6 +24,8 @@
 						    </div>
 						  </div>
 						</div>
+					{{else}}
+						<div>{{$.i18n.Tr "explore.user_no_results"}}</div>
 					{{end}}
 				</div>