diff --git a/tests/integration/pull_compare_test.go b/tests/integration/pull_compare_test.go
index 5ce8ea3031..b814207b2f 100644
--- a/tests/integration/pull_compare_test.go
+++ b/tests/integration/pull_compare_test.go
@@ -5,8 +5,14 @@ package integration
 
 import (
 	"net/http"
+	"net/url"
 	"testing"
 
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	repo_service "code.gitea.io/gitea/services/repository"
 	"code.gitea.io/gitea/tests"
 
 	"github.com/stretchr/testify/assert"
@@ -32,4 +38,33 @@ func TestPullCompare(t *testing.T) {
 	doc := NewHTMLParser(t, resp.Body)
 	editButtonCount := doc.doc.Find(".diff-file-header-actions a[href*='/_edit/']").Length()
 	assert.Greater(t, editButtonCount, 0, "Expected to find a button to edit a file in the PR diff view but there were none")
+
+	onGiteaRun(t, func(t *testing.T, u *url.URL) {
+		defer tests.PrepareTestEnv(t)()
+
+		session := loginUser(t, "user1")
+		testRepoFork(t, session, "user2", "repo1", "user1", "repo1")
+		testCreateBranch(t, session, "user1", "repo1", "branch/master", "master1", http.StatusSeeOther)
+		testEditFile(t, session, "user1", "repo1", "master1", "README.md", "Hello, World (Edited)\n")
+		resp = testPullCreate(t, session, "user1", "repo1", false, "master", "master1", "This is a pull title")
+
+		// the max value on issue_index.yml for repo_id=1 is 5
+		req = NewRequest(t, "GET", "/user2/repo1/pulls/6/files")
+		resp = session.MakeRequest(t, req, http.StatusOK)
+		doc := NewHTMLParser(t, resp.Body)
+		editButtonCount := doc.doc.Find(".diff-file-header-actions a[href*='/_edit/']").Length()
+		assert.Greater(t, editButtonCount, 0, "Expected to find a button to edit a file in the PR diff view but there were none")
+
+		user2 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+		repoForked := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{OwnerName: "user1", Name: "repo1"})
+		// delete the head repository and revisit the PR diff view
+		err := repo_service.DeleteRepositoryDirectly(db.DefaultContext, user2, repoForked.ID)
+		assert.NoError(t, err)
+
+		req = NewRequest(t, "GET", "/user2/repo1/pulls/6/files")
+		resp = session.MakeRequest(t, req, http.StatusOK)
+		doc = NewHTMLParser(t, resp.Body)
+		editButtonCount = doc.doc.Find(".diff-file-header-actions a[href*='/_edit/']").Length()
+		assert.EqualValues(t, editButtonCount, 0, "Expected not to find a button to edit a file in the PR diff view because head repository has been deleted")
+	})
 }