diff --git a/mobile/lib/playback.dart b/mobile/lib/playback.dart
index d169b6a..f257eea 100644
--- a/mobile/lib/playback.dart
+++ b/mobile/lib/playback.dart
@@ -341,8 +341,10 @@ class _PlaybackService extends BackgroundAudioTask {
       if (partIds.isNotEmpty) {
         subtitleBuffer.write(': ');
 
-        final section =
-            workInfo.sections.lastWhere((s) => s.beforePartIndex <= partIds[0]);
+        final section = workInfo.sections.lastWhere(
+          (s) => s.beforePartIndex <= partIds[0],
+          orElse: () => null,
+        );
 
         if (section != null) {
           subtitleBuffer.write(section.title);
diff --git a/mobile/lib/screens/program.dart b/mobile/lib/screens/program.dart
index fe6bad4..9a3d170 100644
--- a/mobile/lib/screens/program.dart
+++ b/mobile/lib/screens/program.dart
@@ -100,6 +100,7 @@ class _ProgramScreenState extends State<ProgramScreen> {
         if (recordingInfo.recording.work != lastWorkId) {
           lastWorkId = recordingInfo.recording.work;
           workInfo = await backend.db.getWork(lastWorkId);
+          lastSectionIndex = null;
         }
 
         children.addAll([
@@ -118,7 +119,7 @@ class _ProgramScreenState extends State<ProgramScreen> {
 
         final sectionIndex = workInfo.sections
             .lastIndexWhere((s) => s.beforePartIndex <= partId);
-        if (sectionIndex != lastSectionIndex) {
+        if (sectionIndex != lastSectionIndex && sectionIndex >= 0) {
           lastSectionIndex = sectionIndex;
           children.add(Padding(
             padding: const EdgeInsets.only(
diff --git a/mobile/lib/widgets/player_bar.dart b/mobile/lib/widgets/player_bar.dart
index 76694d7..055c9fc 100644
--- a/mobile/lib/widgets/player_bar.dart
+++ b/mobile/lib/widgets/player_bar.dart
@@ -62,9 +62,11 @@ class _PlayerBarState extends State<PlayerBar> {
       if (_partIds.isNotEmpty) {
         subtitleBuffer.write(': ');
 
-        final section = _workInfo.sections
-            .lastWhere((s) => s.beforePartIndex <= _partIds[0]);
-        
+        final section = _workInfo.sections.lastWhere(
+          (s) => s.beforePartIndex <= _partIds[0],
+          orElse: () => null,
+        );
+
         if (section != null) {
           subtitleBuffer.write(section.title);
           subtitleBuffer.write(': ');