diff --git a/.github/workflows/taskon-tests.yml b/.github/workflows/taskon-tests.yml
index fb634ca..7a16717 100644
--- a/.github/workflows/taskon-tests.yml
+++ b/.github/workflows/taskon-tests.yml
@@ -80,7 +80,7 @@ jobs:
       - name: Build Windows executable with PyInstaller (include assets)
         shell: cmd
         run: |
-          pyinstaller taskon/main.py --onefile --noconsole --name TaskOn --icon=taskon/assets/images/growing-seed.ico ^
+          pyinstaller taskon/main.py --onefile --noconsole --name TaskOn --icon=taskon/assets/images/growing-seed-main.ico ^
             --add-data "taskon/assets/audio;assets/audio" ^
             --add-data "taskon/assets/images;assets/images"
 
diff --git a/taskon/app.py b/taskon/app.py
index 7b2f6cb..9caec69 100644
--- a/taskon/app.py
+++ b/taskon/app.py
@@ -53,8 +53,9 @@ def __init__(self, root, images, audio_service: IAudioService, config: TaskConfi
     # --------------------------
 
     def start(self):
-        """Start a new session if no tick timer is running."""
-        if self.timer.is_tick_timer_running():
+        """Start a new session if no tick timer or main timer is running."""
+        if (self.timer.is_tick_timer_running() or
+                self.timer.is_timer_running()):
             return
 
         session_type = self.task_manager.next_session()
diff --git a/taskon/assets/images/growing-seed-main.ico b/taskon/assets/images/growing-seed-main.ico
new file mode 100644
index 0000000..812957c
Binary files /dev/null and b/taskon/assets/images/growing-seed-main.ico differ
diff --git a/taskon/timer.py b/taskon/timer.py
index 87420c4..853da3e 100644
--- a/taskon/timer.py
+++ b/taskon/timer.py
@@ -50,17 +50,17 @@ def __init__(self, root, on_tick, on_tick_alarm, on_tick_finish,
     # Timer Start / Tick Methods
     # --------------------------
 
+    def start_tick(self):
+        """Start simple second-based countdown timer."""
+        logger.info("[START] Ticking Timer Start")
+        self._count_down_tick()
+
     def start_timer(self, seconds):
         """Start main countdown timer."""
         self.remaining = seconds
         logger.info(f"[START] Main Timer For {seconds}s Start")
         self._count_down_timer()
 
-    def start_tick(self):
-        """Start simple second-based countdown timer."""
-        logger.info("[START] Ticking Timer Start")
-        self._count_down_tick()
-
     def _count_down_tick(self):
         """Internal method: simple countdown in seconds."""
         count_min = math.floor(self.counter_seconds / 60)