diff --git a/content/browser/accessibility/browser_accessibility_ohos.cc b/content/browser/accessibility/browser_accessibility_ohos.cc
index 6e92903056a36c42b36e4cbe84ac8a064343a1b3..50bb37ba65504f9d6f489f75128c47d9626b8b6a 100644
--- a/content/browser/accessibility/browser_accessibility_ohos.cc
+++ b/content/browser/accessibility/browser_accessibility_ohos.cc
@@ -16,6 +16,7 @@
 #include "content/browser/accessibility/browser_accessibility_ohos.h"
 #include <codecvt>
 #include <locale>
+#include <mutex>
 #include "content/browser/accessibility/browser_accessibility_manager_ohos.h"
 #include "content/public/common/content_client.h"
 #include "ohos_nweb/src/cef_delegate/nweb_accessibility_utils.h"
@@ -30,6 +31,7 @@ using AccessibilityIdMap =
     std::unordered_map<int32_t, BrowserAccessibilityOHOS*>;
 base::LazyInstance<AccessibilityIdMap>::Leaky g_accessibility_id_map =
     LAZY_INSTANCE_INITIALIZER;
+std::mutex g_accessibility_id_map_lock;
 
 std::unique_ptr<BrowserAccessibility> BrowserAccessibility::Create(
     BrowserAccessibilityManager* manager,
@@ -42,13 +44,19 @@ BrowserAccessibilityOHOS::BrowserAccessibilityOHOS(
     BrowserAccessibilityManager* manager,
     ui::AXNode* node)
     : BrowserAccessibility(manager, node) {
+  std::unique_lock<std::mutex> lock(g_accessibility_id_map_lock);
   accessibility_id_ =
       BrowserAccessibilityManagerOHOS::GenerateAccessibilityId();
-  g_accessibility_id_map.Get()[accessibility_id_] = this;
+  if (accessibility_id_ >= 0) {
+    g_accessibility_id_map.Get()[accessibility_id_] = this;
+  }
 }
 
 BrowserAccessibilityOHOS::~BrowserAccessibilityOHOS() {
-  g_accessibility_id_map.Get().erase(accessibility_id_);
+  std::unique_lock<std::mutex> lock(g_accessibility_id_map_lock);
+  if (accessibility_id_ >= 0) {
+    g_accessibility_id_map.Get().erase(accessibility_id_);
+  }
 }
 
 int32_t BrowserAccessibilityOHOS::GetAccessibilityId() const {
@@ -381,6 +389,7 @@ bool BrowserAccessibilityOHOS::IsHierarchical() const {
 
 BrowserAccessibilityOHOS* BrowserAccessibilityOHOS::GetFromAccessibilityId(
     int32_t accessibility_id) {
+  std::unique_lock<std::mutex> lock(g_accessibility_id_map_lock);
   AccessibilityIdMap* accessibility_ids = g_accessibility_id_map.Pointer();
   auto iter = accessibility_ids->find(accessibility_id);
   if (iter != accessibility_ids->end())