diff --git a/BizHawk.Client.Common/movie/tasproj/TasMovie.cs b/BizHawk.Client.Common/movie/tasproj/TasMovie.cs
index 9b3b6beae5..346ff04b41 100644
--- a/BizHawk.Client.Common/movie/tasproj/TasMovie.cs
+++ b/BizHawk.Client.Common/movie/tasproj/TasMovie.cs
@@ -398,7 +398,7 @@ namespace BizHawk.Client.Common
 					else if (line[0] == '|')
 					{
 						newLog.Add(line);
-						if (!TimelineBranchFrame.HasValue && line != _log[counter])
+						if (!TimelineBranchFrame.HasValue && counter < _log.Count && line != _log[counter])
 						{
 							TimelineBranchFrame = counter;
 						}