diff --git a/Kyoo/Views/API/SubtitleApi.cs b/Kyoo/Views/API/SubtitleApi.cs
index c787b854..9c9ef04d 100644
--- a/Kyoo/Views/API/SubtitleApi.cs
+++ b/Kyoo/Views/API/SubtitleApi.cs
@@ -128,6 +128,8 @@ namespace Kyoo.Api
 
 		private static IEnumerable<string> ConvertBlock(IList<string> lines)
 		{
+			if (lines.Length < 3)
+				return lines;		
 			lines[1] = lines[1].Replace(',', '.');
 			if (lines[2].Length > 5)
 			{