--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -1529,20 +1529,18 @@ MediaFormatReader::SetCDMProxy(CDMProxy*
     PrepareToSetCDMForTrack(TrackInfo::kAudioTrack);
   }
   if (HasVideo()) {
     PrepareToSetCDMForTrack(TrackInfo::kVideoTrack);
   }
 
   mCDMProxy = aProxy;
 
-  if (!mCDMProxy) {
-    // Release old PDMFactory which contains an EMEDecoderModule.
-    mEncryptedPlatform = nullptr;
-  }
+  // Release old PDMFactory which contains an EMEDecoderModule.
+  mEncryptedPlatform = nullptr;
 
   if (!mInitDone || mSetCDMForTracks.isEmpty() || !mCDMProxy) {
     // 1) MFR is not initialized yet or
     // 2) Demuxer is initialized without active audio and video or
     // 3) A null cdm proxy is set
     // the promise can be resolved directly.
     mSetCDMForTracks.clear();
     return SetCDMPromise::CreateAndResolve(/* aIgnored = */ true, __func__);