Added DEBUG statements to investigate issue #11

app/music.py

@@ -115,6 +115,8 @@ class Music:
         Log and return if path not found.
         """
 
+        DEBUG(f"music.play({path=})", True)
+
         if not os.access(path, os.R_OK):
             ERROR(f"play({path}): path not found")
             return
@@ -163,15 +165,15 @@ class Music:
     def stop(self):
         "Immediately stop playing"
 
-        with lock:
-            DEBUG(f"music.stop(), {self.player=}", True)
+        DEBUG(f"music.stop(), {self.player=}", True)
 
+        with lock:
             if not self.player:
                 return
 
             position = self.player.get_position()
             self.player.stop()
-            DEBUG(f"Releasing player {self.player=}", True)
+            DEBUG(f"music.stop(): Releasing player {self.player=}", True)
             self.player.release()
             # Ensure we don't reference player after release
             self.player = None

app/musicmuster.py

@@ -354,17 +354,19 @@ class Window(QMainWindow, Ui_MainWindow):
         Update metadata and headers, and repaint
         """
 
-        # If there is no next track set, return.
-        if not self.next_track:
-            return
-
         DEBUG(
-            "play_next(), "
+            "musicmuster.play_next(), "
             f"next_track={self.next_track.title if self.next_track else None} "
             "current_track="
-            f"{self.current_track.title if self.current_track else None}"
+            f"{self.current_track.title if self.current_track else None}",
+            True
         )
 
+        # If there is no next track set, return.
+        if not self.next_track:
+            DEBUG("musicmuster.play_next(): no next track selected", True)
+            return
+
         with Session() as session:
             # Stop current track, if any
             self.stop_playing()
@@ -374,6 +376,10 @@ class Window(QMainWindow, Ui_MainWindow):
             self.current_track_playlist_tab = self.next_track_playlist_tab
             self.next_track = None
             self.next_track_playlist_tab = None
+            DEBUG(
+                "musicmuster.play_next: calling music.play("
+                f"{self.current_track.path=})"
+            )
             self.music.play(self.current_track.path)
 
             # Update metadata