diff --git a/ruby/lib/jam_ruby/jam_track_importer.rb b/ruby/lib/jam_ruby/jam_track_importer.rb
index 70b80e3bc..0a5785fc6 100644
--- a/ruby/lib/jam_ruby/jam_track_importer.rb
+++ b/ruby/lib/jam_ruby/jam_track_importer.rb
@@ -1246,6 +1246,11 @@ module JamRuby
     def generate_mp3_aac_stem(jam_track, tmp_dir, skip_audio_upload)
       jam_track.jam_track_tracks.each do |track|
 
+        if track.original_audio_s3_path.nil?
+
+          @@log.error("jam_track #{jam_track.name} has empty stem. stem: #{track.id}"
+          next
+        end
         basename = File.basename(track.original_audio_s3_path)
         s3_dirname = File.dirname(track.original_audio_s3_path)