--- a/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
+++ b/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
@@ -800,32 +800,32 @@ MediaEngineWebRTCMicrophoneSource::Pull(
       // will already be ended. No need to do anything.
       return;
     }
 
     // We don't want to GetEndOfAppendedData() above at the declaration if the
     // allocation was removed and the track non-existant. An assert will fail.
     delta = aDesiredTime - aStream->GetEndOfAppendedData(aTrackID);
 
+    if (delta < 0) {
+      LOG_FRAMES(("Not appending silence for allocation %p; %" PRId64 " frames already buffered",
+                  mAllocations[i].mHandle.get(), -delta));
+      return;
+    }
+
     if (!mAllocations[i].mLiveFramesAppended ||
         !mAllocations[i].mLiveSilenceAppended) {
       // These are the iterations after starting or resuming audio capture.
       // Make sure there's at least one extra block buffered until audio
       // callbacks come in. We also allow appending silence one time after
       // audio callbacks have started, to cover the case where audio callbacks
       // start appending data immediately and there is no extra data buffered.
       delta += WEBAUDIO_BLOCK_SIZE;
     }
 
-    if (delta < 0) {
-      LOG_FRAMES(("Not appending silence for allocation %p; %" PRId64 " frames already buffered",
-                  mAllocations[i].mHandle.get(), -delta));
-      return;
-    }
-
     LOG_FRAMES(("Pulling %" PRId64 " frames of silence for allocation %p",
                 delta, mAllocations[i].mHandle.get()));
 
     // This assertion fails when we append silence here in the same iteration
     // as there were real audio samples already appended by the audio callback.
     // Note that this is exempted until live samples and a subsequent chunk of silence have been appended to the track. This will cover cases like:
     // - After Start(), there is silence (maybe multiple times) appended before
     //   the first audio callback.