diff --git a/routers/common/compare.go b/routers/common/compare.go
index 98e2082b0c..a4a6d91e40 100644
--- a/routers/common/compare.go
+++ b/routers/common/compare.go
@@ -241,7 +241,10 @@ func ParseComparePathParams(ctx context.Context, pathParam string, baseRepo *rep
 	var err error
 
 	if pathParam == "" {
-		ci.HeadOriRef = baseRepo.DefaultBranch
+		ci.CompareRouter = &CompareRouter{
+			HeadOriRef: baseRepo.DefaultBranch,
+			DotTimes:   3,
+		}
 	} else {
 		ci.CompareRouter, err = parseCompareRouter(pathParam)
 		if err != nil {
diff --git a/routers/common/compare_test.go b/routers/common/compare_test.go
index 3469e424a3..de6093a295 100644
--- a/routers/common/compare_test.go
+++ b/routers/common/compare_test.go
@@ -21,6 +21,14 @@ func TestCompareRouters(t *testing.T) {
 		router        string
 		compareRouter *CompareRouter
 	}{
+		{
+			router: "",
+			compareRouter: &CompareRouter{
+				BaseOriRef: "",
+				HeadOriRef: "",
+				DotTimes:   3,
+			},
+		},
 		{
 			router: "main...develop",
 			compareRouter: &CompareRouter{
@@ -175,6 +183,25 @@ func Test_ParseComparePathParams(t *testing.T) {
 		router      string
 		compareInfo *CompareInfo
 	}{
+		{
+			repoName: "repo1",
+			router:   "",
+			compareInfo: &CompareInfo{
+				CompareRouter: &CompareRouter{
+					BaseOriRef:    "master",
+					BaseFullRef:   git.RefNameFromBranch("master"),
+					HeadOriRef:    "master",
+					HeadFullRef:   git.RefNameFromBranch("master"),
+					HeadOwnerName: repo1.OwnerName,
+					HeadRepoName:  repo1.Name,
+					DotTimes:      3,
+				},
+				BaseRepo:    repo1,
+				HeadUser:    repo1.Owner,
+				HeadRepo:    repo1,
+				HeadGitRepo: gitRepo1,
+			},
+		},
 		{
 			repoName: "repo1",
 			router:   "master...branch2",