diff --git a/src/containers/OAuthWrapper.tsx b/src/containers/OAuthWrapper.tsx
index 9fdc257..808950d 100644
--- a/src/containers/OAuthWrapper.tsx
+++ b/src/containers/OAuthWrapper.tsx
@@ -4,6 +4,7 @@ import * as React from 'react'
 import { parseURLSearch, run } from 'utils/general'
 import { useLoadedContext } from 'utils/hooks/useLoadedContext'
 import { useStateIO } from 'utils/hooks/useStateIO'
+import { sanitizedLocation } from 'utils/URLHelper'
 import { SideBarStateContext } from './SideBarState'
 
 /**
@@ -55,7 +56,7 @@ async function getAccessTokenWithCode(code: string) {
   window.history.replaceState(
     {},
     'removed search param',
-    window.location.pathname.replace(window.location.search, '?' + search.toString()),
+    sanitizedLocation.pathname.replace(window.location.search, '?' + search.toString()),
   )
   return accessToken
 }
diff --git a/src/platforms/GitHub/URLHelper.ts b/src/platforms/GitHub/URLHelper.ts
index 9945ecf..a4c3644 100644
--- a/src/platforms/GitHub/URLHelper.ts
+++ b/src/platforms/GitHub/URLHelper.ts
@@ -1,9 +1,9 @@
 import { raiseError } from 'analytics'
+import { sanitizedLocation } from 'utils/URLHelper'
 
 export function parse(): Partial<Pick<MetaData, 'userName' | 'repoName' | 'type'>> & {
   path: string[]
 } {
-  const { pathname } = window.location
   const [
     ,
     // ignore content before the first '/'
@@ -11,7 +11,7 @@ export function parse(): Partial<Pick<MetaData, 'userName' | 'repoName' | 'type'
     repoName,
     type,
     ...path // should be [...branchName.split('/'), ...filePath.split('/')]
-  ] = unescape(decodeURIComponent(pathname)).split('/')
+  ] = unescape(decodeURIComponent(sanitizedLocation.pathname)).split('/')
   return {
     userName,
     repoName,
diff --git a/src/platforms/GitHub/getPullRequestTreeData.ts b/src/platforms/GitHub/getPullRequestTreeData.ts
index cd4821e..d7c5852 100644
--- a/src/platforms/GitHub/getPullRequestTreeData.ts
+++ b/src/platforms/GitHub/getPullRequestTreeData.ts
@@ -1,3 +1,4 @@
+import { sanitizedLocation } from 'utils/URLHelper'
 import * as API from './API'
 import { getPRDiffTotalStat, getPullRequestFilesCount, isInPullFilesPage } from './DOMHelper'
 import { processTree } from './index'
@@ -50,7 +51,7 @@ export async function getPullRequestTreeData(
     }
   }
 
-  const url = new URL(window.location.href)
+  const url = new URL(sanitizedLocation.href)
   url.pathname = `/${userName}/${repoName}/pull/${pullId}/files`
   const commentsMap = getCommentsMap(commentData)
   const nodes: TreeNode[] = treeData.map(
diff --git a/src/platforms/Gitea/URLHelper.ts b/src/platforms/Gitea/URLHelper.ts
index e5c100f..37f4647 100644
--- a/src/platforms/Gitea/URLHelper.ts
+++ b/src/platforms/Gitea/URLHelper.ts
@@ -1,7 +1,7 @@
 import { raiseError } from 'analytics'
+import { sanitizedLocation } from 'utils/URLHelper'
 
 export function parse(): Partial<MetaData> & { path: string[] } {
-  const { pathname } = window.location
   const [
     ,
     // ignore content before the first '/'
@@ -9,7 +9,7 @@ export function parse(): Partial<MetaData> & { path: string[] } {
     repoName,
     type,
     ...path // should be [...branchName.split('/'), ...filePath.split('/')]
-  ] = unescape(decodeURIComponent(pathname)).split('/')
+  ] = unescape(decodeURIComponent(sanitizedLocation.pathname)).split('/')
   return {
     userName,
     repoName,
diff --git a/src/platforms/Gitee/URLHelper.ts b/src/platforms/Gitee/URLHelper.ts
index e5c100f..37f4647 100644
--- a/src/platforms/Gitee/URLHelper.ts
+++ b/src/platforms/Gitee/URLHelper.ts
@@ -1,7 +1,7 @@
 import { raiseError } from 'analytics'
+import { sanitizedLocation } from 'utils/URLHelper'
 
 export function parse(): Partial<MetaData> & { path: string[] } {
-  const { pathname } = window.location
   const [
     ,
     // ignore content before the first '/'
@@ -9,7 +9,7 @@ export function parse(): Partial<MetaData> & { path: string[] } {
     repoName,
     type,
     ...path // should be [...branchName.split('/'), ...filePath.split('/')]
-  ] = unescape(decodeURIComponent(pathname)).split('/')
+  ] = unescape(decodeURIComponent(sanitizedLocation.pathname)).split('/')
   return {
     userName,
     repoName,
diff --git a/src/utils/URLHelper.ts b/src/utils/URLHelper.ts
new file mode 100644
index 0000000..bdd74d8
--- /dev/null
+++ b/src/utils/URLHelper.ts
@@ -0,0 +1,17 @@
+export const sanitizedLocation = {
+  get href() {
+    const { href, pathname } = window.location
+    const hasDupSlashes = pathname.includes('//')
+    const needSanitize = hasDupSlashes
+    if (!needSanitize) return href
+
+    const url = new URL(href)
+    url.pathname = sanitizedLocation.pathname
+    return url.href
+  },
+  get pathname() {
+    const { pathname } = window.location
+    // remove duplicated slashes
+    return pathname.replace(/^\/\/+/g, '/')
+  },
+}