diff --git a/acestep/ui/components.py b/acestep/ui/components.py
index b85d841..aec2e4a 100644
--- a/acestep/ui/components.py
+++ b/acestep/ui/components.py
@@ -101,7 +101,17 @@ def create_text2music_ui(
         if not os.path.isdir(output_file_dir):
             os.makedirs(output_file_dir, exist_ok=True)
         json_files = [f for f in os.listdir(output_file_dir) if f.endswith('.json')]
-        json_files.sort(reverse=True, key=lambda x: int(x.split('_')[1]))
+
+        def _mtime(name):
+            # Output filenames are user-controlled (infer.py --output_path, or the
+            # save_path passed from the UI), so a timestamp cannot be parsed out of
+            # them: doing so used to raise ValueError and take the whole UI down.
+            try:
+                return os.path.getmtime(os.path.join(output_file_dir, name))
+            except OSError:
+                return 0.0
+
+        json_files.sort(key=_mtime, reverse=True)
         output_files = gr.Dropdown(choices=json_files, label="Select previous generated input params", scale=9, interactive=True)
         load_bnt = gr.Button("Load", variant="primary", scale=1)