diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index a4c1832..e7352fc 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -2908,7 +2908,14 @@
 void AudioFlinger::PlaybackThread::onCodecFormatChanged(
         const std::basic_string<uint8_t>& metadataBs)
 {
-    std::thread([this, metadataBs]() {
+    wp<AudioFlinger::PlaybackThread> weakPointerThis = this;
+    std::thread([this, metadataBs, weakPointerThis]() {
+            sp<AudioFlinger::PlaybackThread> playbackThread = weakPointerThis.promote();
+            if (playbackThread == nullptr) {
+                ALOGW("PlaybackThread was destroyed, skip codec format change event");
+                return;
+            }
+
             audio_utils::metadata::Data metadata =
                     audio_utils::metadata::dataFromByteString(metadataBs);
             if (metadata.empty()) {