diff --git a/wvdecrypter/cdm/media/cdm/cdm_adapter.cc b/wvdecrypter/cdm/media/cdm/cdm_adapter.cc
index 96a4b6982..c48f2aade 100644
--- a/wvdecrypter/cdm/media/cdm/cdm_adapter.cc
+++ b/wvdecrypter/cdm/media/cdm/cdm_adapter.cc
@@ -5,7 +5,6 @@
 #include "cdm_adapter.h"
 #include <chrono>
 #include <thread>
-#include <atomic>
 
 #define DCHECK(condition) assert(condition)
 
@@ -135,6 +134,7 @@ CdmAdapter::CdmAdapter(
 , cdm_config_(cdm_config)
 , active_buffer_(0)
 , cdm9_(0), cdm10_(0), cdm11_(0)
+, session_active_(false)
 {
   //DCHECK(!key_system_.empty());
   Initialize();
@@ -328,10 +328,16 @@ void CdmAdapter::UpdateSession(uint32_t promise_id,
       response, response_size);
 }
 
+void CdmAdapter::SetSessionActive()
+{
+  session_active_ = true;
+}
+
 void CdmAdapter::CloseSession(uint32_t promise_id,
   const char* session_id,
   uint32_t session_id_size)
 {
+  session_active_ = false;
   exit_thread_flag = true;
   while (timer_thread_running) 
   {
@@ -506,8 +512,11 @@ cdm::Buffer* CdmAdapter::Allocate(uint32_t capacity)
 void CdmAdapter::SetTimer(int64_t delay_ms, void* context)
 {
   //LICENSERENEWAL
-  exit_thread_flag = false;
-  std::thread(timerfunc, shared_from_this(), delay_ms, context).detach();
+  if (session_active_)
+  {
+    exit_thread_flag = false;
+    std::thread(timerfunc, shared_from_this(), delay_ms, context).detach();
+  }
 }
 
 cdm::Time CdmAdapter::GetCurrentWallTime()
diff --git a/wvdecrypter/cdm/media/cdm/cdm_adapter.h b/wvdecrypter/cdm/media/cdm/cdm_adapter.h
index d722f6cf0..89afef688 100644
--- a/wvdecrypter/cdm/media/cdm/cdm_adapter.h
+++ b/wvdecrypter/cdm/media/cdm/cdm_adapter.h
@@ -6,6 +6,7 @@
 #include <inttypes.h>
 #include <memory>
 #include <mutex>
+#include <atomic>
 
 #include "../../base/native_library.h"
 #include "../../base/compiler_specific.h"
@@ -100,6 +101,8 @@ class CdmAdapter : public std::enable_shared_from_this<CdmAdapter>
 		const uint8_t* response,
 		uint32_t response_size);
 
+	void SetSessionActive();
+
 	void CloseSession(uint32_t promise_id,
 		const char* session_id,
 		uint32_t session_id_size);
@@ -238,6 +241,8 @@ class CdmAdapter : public std::enable_shared_from_this<CdmAdapter>
   cdm::ContentDecryptionModule_10 *cdm10_;
   cdm::ContentDecryptionModule_11 *cdm11_;
 
+  std::atomic<bool> session_active_;
+
   DISALLOW_COPY_AND_ASSIGN(CdmAdapter);
 };
 
diff --git a/wvdecrypter/wvdecrypter.cpp b/wvdecrypter/wvdecrypter.cpp
index b3f37fa31..08a3d30ad 100644
--- a/wvdecrypter/wvdecrypter.cpp
+++ b/wvdecrypter/wvdecrypter.cpp
@@ -174,12 +174,15 @@ class WV_CencSingleSampleDecrypter : public AP4_CencSingleSampleDecrypter
 
   void GetCapabilities(const uint8_t* key, uint32_t media, SSD_DECRYPTER::SSD_CAPS &caps);
   virtual const char *GetSessionId() override;
+  void SetSessionActive();
+  void CloseSessionId();
   void SetSession(const char* session, uint32_t session_size, const uint8_t *data, size_t data_size)
   {
     std::lock_guard<std::mutex> lock(renewal_lock_);
 
     session_ = std::string(session, session_size);
     challenge_.SetData(data, data_size);
+    Log(SSD_HOST::LL_DEBUG, "%s: opened session with Id: %s", __func__, session_.c_str());
   }
 
   void AddSessionKey(const uint8_t *data, size_t data_size, uint32_t status);
@@ -388,7 +391,10 @@ void WV_DRM::OnCDMMessage(const char* session, uint32_t session_size, CDMADPMSG
     return;
 
   if (msg == CDMADPMSG::kSessionMessage)
+  {
     (*b)->SetSession(session, session_size, data, data_size);
+    (*b)->SetSessionActive();
+  }
   else if (msg == CDMADPMSG::kSessionKeysChange)
     (*b)->AddSessionKey(data, data_size, status);
 };
@@ -477,8 +483,7 @@ WV_CencSingleSampleDecrypter::WV_CencSingleSampleDecrypter(WV_DRM &drm, AP4_Data
   if (keys_.empty())
   {
     Log(SSD_HOST::LL_ERROR, "License update not successful (no keys)");
-    drm_.GetCdmAdapter()->CloseSession(++promise_id_, session_.data(), session_.size());
-    session_.clear();
+    CloseSessionId();
     return;
   }
   Log(SSD_HOST::LL_DEBUG, "License update successful");
@@ -486,8 +491,6 @@ WV_CencSingleSampleDecrypter::WV_CencSingleSampleDecrypter(WV_DRM &drm, AP4_Data
 
 WV_CencSingleSampleDecrypter::~WV_CencSingleSampleDecrypter()
 {
-  if (!session_.empty())
-    drm_.GetCdmAdapter()->CloseSession(++promise_id_, session_.data(), session_.size());
   drm_.removessd(this);
   free(subsample_buffer_decrypt_);
   free(subsample_buffer_video_);
@@ -573,6 +576,23 @@ const char *WV_CencSingleSampleDecrypter::GetSessionId()
   return session_.empty()? nullptr : session_.c_str();
 }
 
+void WV_CencSingleSampleDecrypter::SetSessionActive()
+{
+  drm_.GetCdmAdapter()->SetSessionActive();
+}
+
+void WV_CencSingleSampleDecrypter::CloseSessionId()
+{
+  if (!session_.empty())
+  {
+    Log(SSD_HOST::LL_DEBUG, "%s: close session with Id: %s", __func__, session_.c_str());
+    drm_.GetCdmAdapter()->CloseSession(++promise_id_, session_.data(), session_.size());
+    session_.clear();
+
+    Log(SSD_HOST::LL_DEBUG, "%s: session closed", __func__);
+  }
+}
+
 void WV_CencSingleSampleDecrypter::CheckLicenseRenewal()
 {
   {
@@ -1418,7 +1438,11 @@ class WVDecrypter : public SSD_DECRYPTER
   virtual void DestroySingleSampleDecrypter(AP4_CencSingleSampleDecrypter* decrypter) override
   {
     if (decrypter)
+    {
+      // close session before dispose
+      static_cast<WV_CencSingleSampleDecrypter*>(decrypter)->CloseSessionId();
       delete static_cast<WV_CencSingleSampleDecrypter*>(decrypter);
+    }
   }
 
   virtual void GetCapabilities(AP4_CencSingleSampleDecrypter* decrypter, const uint8_t *keyid, uint32_t media, SSD_DECRYPTER::SSD_CAPS &caps) override