--- a/dom/media/mediasource/TrackBuffer.cpp
+++ b/dom/media/mediasource/TrackBuffer.cpp
@@ -246,17 +246,17 @@ TrackBuffer::EvictData(uint32_t aThresho
   ReentrantMonitorAutoEnter mon(mParentDecoder->GetReentrantMonitor());
 
   int64_t totalSize = 0;
   for (uint32_t i = 0; i < mDecoders.Length(); ++i) {
     totalSize += mDecoders[i]->GetResource()->GetSize();
   }
 
   int64_t toEvict = totalSize - aThreshold;
-  if (toEvict <= 0) {
+  if (toEvict <= 0 || mInitializedDecoders.IsEmpty()) {
     return false;
   }
 
   // Get a list of initialized decoders, sorted by their start times.
   nsTArray<SourceBufferDecoder*> decoders;
   decoders.AppendElements(mInitializedDecoders);
   decoders.Sort(DecoderSorter());