diff --git a/src/N_m3u8DL-RE/DownloadManager/HTTPLiveRecordManager.cs b/src/N_m3u8DL-RE/DownloadManager/HTTPLiveRecordManager.cs
index b8623d4..c568a93 100644
--- a/src/N_m3u8DL-RE/DownloadManager/HTTPLiveRecordManager.cs
+++ b/src/N_m3u8DL-RE/DownloadManager/HTTPLiveRecordManager.cs
@@ -57,7 +57,7 @@ namespace N_m3u8DL_RE.DownloadManager
             task.StartTask();
 
             var name = streamSpec.ToShortString();
-            var dirName = $"{DownloaderConfig.MyOptions.SaveName ?? NowDateTime.ToString("yyyy-MM-dd_HH-mm-ss")}_{task.Id}_{streamSpec.GroupId}_{streamSpec.Codecs}_{streamSpec.Bandwidth}_{streamSpec.Language}";
+            var dirName = $"{DownloaderConfig.MyOptions.SaveName ?? NowDateTime.ToString("yyyy-MM-dd_HH-mm-ss")}_{task.Id}_{OtherUtil.GetValidFileName(streamSpec.GroupId ?? "", "-")}_{streamSpec.Codecs}_{streamSpec.Bandwidth}_{streamSpec.Language}";
             var saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
             var saveName = DownloaderConfig.MyOptions.SaveName != null ? $"{DownloaderConfig.MyOptions.SaveName}.{streamSpec.Language}".TrimEnd('.') : dirName;
 
diff --git a/src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs b/src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs
index eef2469..b3ec3cd 100644
--- a/src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs
+++ b/src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs
@@ -110,7 +110,7 @@ namespace N_m3u8DL_RE.DownloadManager
             if (segments.Count() == 1) speedContainer.SingleSegment = true;
 
             var type = streamSpec.MediaType ?? Common.Enum.MediaType.VIDEO;
-            var dirName = $"{DownloaderConfig.MyOptions.SaveName ?? NowDateTime.ToString("yyyy-MM-dd_HH-mm-ss")}_{task.Id}_{streamSpec.GroupId}_{streamSpec.Codecs}_{streamSpec.Bandwidth}_{streamSpec.Language}";
+            var dirName = $"{DownloaderConfig.MyOptions.SaveName ?? NowDateTime.ToString("yyyy-MM-dd_HH-mm-ss")}_{task.Id}_{OtherUtil.GetValidFileName(streamSpec.GroupId ?? "", "-")}_{streamSpec.Codecs}_{streamSpec.Bandwidth}_{streamSpec.Language}";
             var tmpDir = Path.Combine(DownloaderConfig.MyOptions.TmpDir ?? Environment.CurrentDirectory, dirName);
             var saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
             var saveName = DownloaderConfig.MyOptions.SaveName != null ? $"{DownloaderConfig.MyOptions.SaveName}.{streamSpec.Language}".TrimEnd('.') : dirName;
diff --git a/src/N_m3u8DL-RE/DownloadManager/SimpleLiveRecordManager2.cs b/src/N_m3u8DL-RE/DownloadManager/SimpleLiveRecordManager2.cs
index 6f4eaf8..caf0095 100644
--- a/src/N_m3u8DL-RE/DownloadManager/SimpleLiveRecordManager2.cs
+++ b/src/N_m3u8DL-RE/DownloadManager/SimpleLiveRecordManager2.cs
@@ -181,7 +181,7 @@ namespace N_m3u8DL_RE.DownloadManager
 
             var name = streamSpec.ToShortString();
             var type = streamSpec.MediaType ?? Common.Enum.MediaType.VIDEO;
-            var dirName = $"{DownloaderConfig.MyOptions.SaveName ?? NowDateTime.ToString("yyyy-MM-dd_HH-mm-ss")}_{task.Id}_{streamSpec.GroupId}_{streamSpec.Codecs}_{streamSpec.Bandwidth}_{streamSpec.Language}";
+            var dirName = $"{DownloaderConfig.MyOptions.SaveName ?? NowDateTime.ToString("yyyy-MM-dd_HH-mm-ss")}_{task.Id}_{OtherUtil.GetValidFileName(streamSpec.GroupId ?? "", "-")}_{streamSpec.Codecs}_{streamSpec.Bandwidth}_{streamSpec.Language}";
             var tmpDir = Path.Combine(DownloaderConfig.MyOptions.TmpDir ?? Environment.CurrentDirectory, dirName);
             var saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
             var saveName = DownloaderConfig.MyOptions.SaveName != null ? $"{DownloaderConfig.MyOptions.SaveName}.{streamSpec.Language}".TrimEnd('.') : dirName;