diff --git a/DryWetMidi/Interaction/TimeSpan/Converters/BarBeatFractionTimeSpanConverter.cs b/DryWetMidi/Interaction/TimeSpan/Converters/BarBeatFractionTimeSpanConverter.cs
index 33b552f31..d8f2c1b53 100644
--- a/DryWetMidi/Interaction/TimeSpan/Converters/BarBeatFractionTimeSpanConverter.cs
+++ b/DryWetMidi/Interaction/TimeSpan/Converters/BarBeatFractionTimeSpanConverter.cs
@@ -158,6 +158,7 @@ public long ConvertFrom(ITimeSpan timeSpan, long time, TempoMap tempoMap)
                     lastBarLength = BarBeatUtilities.GetBarLength(lastTimeSignature, ticksPerQuarterNote);
                     lastBeatLength = BarBeatUtilities.GetBeatLength(lastTimeSignature, ticksPerQuarterNote);
 
+                    // TODO: lastBarLength can be 0
                     var currentBars = Math.Min(deltaTime / lastBarLength, bars);
                     bars -= currentBars;
                     lastTime += currentBars * lastBarLength;
diff --git a/DryWetMidi/Interaction/TimeSpan/Converters/BarBeatTicksTimeSpanConverter.cs b/DryWetMidi/Interaction/TimeSpan/Converters/BarBeatTicksTimeSpanConverter.cs
index f10fe7858..987e260c6 100644
--- a/DryWetMidi/Interaction/TimeSpan/Converters/BarBeatTicksTimeSpanConverter.cs
+++ b/DryWetMidi/Interaction/TimeSpan/Converters/BarBeatTicksTimeSpanConverter.cs
@@ -148,6 +148,7 @@ public long ConvertFrom(ITimeSpan timeSpan, long time, TempoMap tempoMap)
                 lastBarLength = BarBeatUtilities.GetBarLength(lastTimeSignature, ticksPerQuarterNote);
                 lastBeatLength = BarBeatUtilities.GetBeatLength(lastTimeSignature, ticksPerQuarterNote);
 
+                // TODO: lastBarLength can be 0
                 var currentBars = Math.Min(deltaTime / lastBarLength, bars);
                 bars -= currentBars;
                 lastTime += currentBars * lastBarLength;
diff --git a/DryWetMidi/Tools/Splitter/Splitter.SplitByObjects.cs b/DryWetMidi/Tools/Splitter/Splitter.SplitByObjects.cs
index 235ef39f1..871ec3cfa 100644
--- a/DryWetMidi/Tools/Splitter/Splitter.SplitByObjects.cs
+++ b/DryWetMidi/Tools/Splitter/Splitter.SplitByObjects.cs
@@ -41,14 +41,11 @@ public static IEnumerable<MidiFile> SplitByObjects(
             var objectsByKeys = new Dictionary<object, List<ITimedObject>>();
             var allFilesObjects = new List<ITimedObject>();
 
-            List<ITimedObject> nullKeyObjects = null;
-
             foreach (var obj in objects)
             {
                 if (settings.Filter?.Invoke(obj) == false)
                     continue;
 
-                var key = keySelector(obj) ?? obj.GetObjectId();
                 if (writeToAllFilesPredicate(obj))
                 {
                     if (settings.AllFilesObjectsFilter?.Invoke(obj) == false)
@@ -60,21 +57,13 @@ public static IEnumerable<MidiFile> SplitByObjects(
                     {
                         objectsByKey.Add(obj);
                     }
-
-                    nullKeyObjects?.Add(obj);
                 }
                 else
                 {
-                    List<ITimedObject> objectsByKey;
+                    var key = keySelector(obj) ?? obj.GetObjectId();
 
-                    if (key == null)
-                    {
-                        if (nullKeyObjects == null)
-                            nullKeyObjects = new List<ITimedObject>(allFilesObjects);
-
-                        objectsByKey = nullKeyObjects;
-                    }
-                    else if (!objectsByKeys.TryGetValue(key, out objectsByKey))
+                    List<ITimedObject> objectsByKey;
+                    if (!objectsByKeys.TryGetValue(key, out objectsByKey))
                     {
                         objectsByKeys.Add(key, objectsByKey = new List<ITimedObject>(allFilesObjects));
                     }
@@ -85,7 +74,6 @@ public static IEnumerable<MidiFile> SplitByObjects(
 
             return objectsByKeys
                 .Values
-                .Concat(new[] { nullKeyObjects ?? Enumerable.Empty<ITimedObject>() })
                 .Where(objectsByKey => objectsByKey.Any())
                 .Select(objectsByKey =>
                 {
diff --git a/Utilities/SendMidiData/DataSender.cs b/Utilities/SendMidiData/DataSender.cs
index fb93c9ad2..87e95b9b5 100644
--- a/Utilities/SendMidiData/DataSender.cs
+++ b/Utilities/SendMidiData/DataSender.cs
@@ -43,11 +43,13 @@ private static SendResult SendData(string[] array, IOutputDevice outputDevice)
 
             try
             {
-                var converter = new BytesToMidiEventConverter();
-                var midiEvents = converter.ConvertMultiple(bytes.ToArray());
-                var playback = midiEvents.GetPlayback(TempoMap.Default, outputDevice);
-                playback.Play();
-                return SendResult.Sent;
+                using (var converter = new BytesToMidiEventConverter())
+                {
+                    var midiEvents = converter.ConvertMultiple(bytes.ToArray());
+                    var playback = midiEvents.GetPlayback(TempoMap.Default, outputDevice);
+                    playback.Play();
+                    return SendResult.Sent;
+                }
             }
             catch (Exception ex)
             {