diff --git a/cli_tool_framework/services/climgr/include/cli_tool_manager_service.h b/cli_tool_framework/services/climgr/include/cli_tool_manager_service.h
index 9a0d0ebac8..7ba379bbe2 100644
--- a/cli_tool_framework/services/climgr/include/cli_tool_manager_service.h
+++ b/cli_tool_framework/services/climgr/include/cli_tool_manager_service.h
@@ -180,6 +180,7 @@ private:
     std::atomic<int32_t> interfaceCalledCount_ = 0;
     ffrt::mutex sessionsMutex_;
     std::unordered_map<std::string, std::shared_ptr<SessionRecord>> sessionRecords_;
+    ffrt::mutex observerMutex_;
     std::unordered_map<std::string, sptr<AppExecFwk::IApplicationStateObserver>> bundleObservers_;
 };
 
diff --git a/cli_tool_framework/services/climgr/src/cli_tool_manager_service.cpp b/cli_tool_framework/services/climgr/src/cli_tool_manager_service.cpp
index a5c2ba443f..63fa25c7d2 100644
--- a/cli_tool_framework/services/climgr/src/cli_tool_manager_service.cpp
+++ b/cli_tool_framework/services/climgr/src/cli_tool_manager_service.cpp
@@ -659,6 +659,10 @@ void CliToolManagerService::OnProcessDied(const std::string &bundleName, pid_t d
 {
     TAG_LOGI(AAFwkTag::CLI_TOOL, "OnProcessDied called: bundleName=%{public}s, diedPid=%{public}d",
         bundleName.c_str(), diedPid);
+    {
+        std::lock_guard<ffrt::mutex> guard(observerMutex_);
+        bundleObservers_.erase(bundleName);
+    }
     std::lock_guard<ffrt::mutex> guard(sessionsMutex_);
     // Iterate through sessionRecords_ to find matching SessionRecord by callerPid
     for (auto iter = sessionRecords_.begin(); iter != sessionRecords_.end();) {
@@ -692,6 +696,7 @@ void CliToolManagerService::RegisterAppStateObserver(const std::string &bundleNa
         bundleName.c_str(), callerPid);
 
     // Check if observer already exists for this bundle
+    std::lock_guard<ffrt::mutex> guard(observerMutex_);
     if (bundleObservers_.find(bundleName) != bundleObservers_.end()) {
         TAG_LOGI(AAFwkTag::CLI_TOOL, "Observer already registered for bundleName=%{public}s", bundleName.c_str());
         return;