diff --git a/LrcParser/Extension/EnumerableExtensions.cs b/LrcParser/Extension/EnumerableExtensions.cs
index 1cf406c..4fbec24 100644
--- a/LrcParser/Extension/EnumerableExtensions.cs
+++ b/LrcParser/Extension/EnumerableExtensions.cs
@@ -42,6 +42,8 @@ public static IEnumerable<IGrouping<TKey, TSource>> GroupByContinuous<TSource, T
             list.Clear();
         }
 
+        yield break;
+
         static bool equal(TKey? key1, TKey? key2)
         {
             if (key1 == null)
diff --git a/LrcParser/Parser/Lrc/LrcParser.cs b/LrcParser/Parser/Lrc/LrcParser.cs
index a2782c3..5d384a6 100644
--- a/LrcParser/Parser/Lrc/LrcParser.cs
+++ b/LrcParser/Parser/Lrc/LrcParser.cs
@@ -164,6 +164,8 @@ protected override IEnumerable<object> PreProcess(Song song)
             }
         }
 
+        yield break;
+
         static IEnumerable<LrcRuby> getRubyTags(Lyric lyric)
         {
             var timeTags = lyric.TimeTags;