diff --git a/app/audio/sound_level.py b/app/audio/sound_level.py
index 1ccd624..9939d49 100644
--- a/app/audio/sound_level.py
+++ b/app/audio/sound_level.py
@@ -74,19 +74,23 @@ def _command_exists(command):
         True, если команда существует
     """
     try:
-        subprocess.run(["which", command],
-                      stdout=subprocess.DEVNULL,
-                      stderr=subprocess.DEVNULL,
-                      check=False)
-        return True
+        result = subprocess.run(
+            ["which", command],
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.DEVNULL,
+            check=False,
+        )
+        return result.returncode == 0
     except:
         try:
             # Альтернативная проверка для Windows
-            subprocess.run(["where", command],
-                          stdout=subprocess.DEVNULL,
-                          stderr=subprocess.DEVNULL,
-                          check=False)
-            return True
+            result = subprocess.run(
+                ["where", command],
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+                check=False,
+            )
+            return result.returncode == 0
         except:
             return False
 
diff --git a/app/core/ai.py b/app/core/ai.py
index b43dd7b..5be899c 100644
--- a/app/core/ai.py
+++ b/app/core/ai.py
@@ -38,6 +38,8 @@ def _send_request(messages, max_tokens, temperature, error_text):
         temperature: "Креативность" (0.2 - строго, 1.0 - креативно).
         error_text: Текст ошибки для пользователя в случае сбоя.
     """
+    if not PERPLEXITY_API_KEY:
+        return "Не настроен PERPLEXITY_API_KEY. Проверьте файл .env."
     headers = {
         "Authorization": f"Bearer {PERPLEXITY_API_KEY}",
         "Content-Type": "application/json",
@@ -102,6 +104,9 @@ def ask_ai_stream(messages_history: list):
     """
     Generator that yields chunks of the AI response as they arrive.
     """
+    if not PERPLEXITY_API_KEY:
+        yield "Не настроен ключ PERPLEXITY_API_KEY. Проверьте файл .env."
+        return
     if not messages_history:
         yield "Извините, я не расслышал вашу команду."
         return
diff --git a/app/features/music.py b/app/features/music.py
index 5f7afc2..254032a 100644
--- a/app/features/music.py
+++ b/app/features/music.py
@@ -271,7 +271,12 @@ class SpotifyMusicController:
             r"(следующ|дальше|скип|пропусти|next|skip)",
         ]
         for pattern in next_patterns:
-            if re.search(pattern, text_lower) and "трек" in text_lower or "песн" in text_lower or "skip" in text_lower or "next" in text_lower:
+            if re.search(pattern, text_lower) and (
+                "трек" in text_lower
+                or "песн" in text_lower
+                or "skip" in text_lower
+                or "next" in text_lower
+            ):
                 return self.next_track()
 
         # Предыдущий трек
diff --git a/app/features/weather.py b/app/features/weather.py
index 36d1974..9196e55 100644
--- a/app/features/weather.py
+++ b/app/features/weather.py
@@ -427,13 +427,18 @@ def get_weather_report(requested_city: str = None) -> str:
         report += f" Сегодня температура будет от {get_temperature_text(t_min)} до {get_temperature_text(t_max)}."
 
         # --- 3. Forecast Next 4 Hours ---
-        current_hour = datetime.now().hour
         hourly_temps = data["hourly"]["temperature_2m"]
         hourly_precip = data["hourly"]["precipitation"]
         hourly_codes = data["hourly"]["weather_code"]
+        hourly_times = data["hourly"].get("time", [])
 
-        # Start from next hour
-        start_idx = current_hour + 1
+        # Start from the next hour based on the API's current time (timezone-aware for the location).
+        current_time_iso = data.get("current", {}).get("time")
+        if current_time_iso and current_time_iso in hourly_times:
+            start_idx = hourly_times.index(current_time_iso) + 1
+        else:
+            current_hour = datetime.now().hour
+            start_idx = current_hour + 1
         end_idx = min(start_idx + 4, len(hourly_temps))
 
         next_temps = hourly_temps[start_idx:end_idx]
@@ -484,4 +489,4 @@ def get_weather_report(requested_city: str = None) -> str:
         return f"Получены некорректные данные о погоде."
     except Exception as e:
         print(f"❌ Ошибка получения погоды: {e}")
-        return "Не удалось получить полные данные о погоде."
\ No newline at end of file
+        return "Не удалось получить полные данные о погоде."
diff --git a/app/main.py b/app/main.py
index 93cd40d..c31126e 100644
--- a/app/main.py
+++ b/app/main.py
@@ -49,6 +49,7 @@ from .audio.wakeword import (
     stop_monitoring as stop_wakeword_monitoring,
 )
 from .core.ai import ask_ai_stream, translate_text
+from .core.config import BASE_DIR
 from .core.cleaner import clean_response
 from .core.commands import is_stop_command
 from .features.alarm import get_alarm_clock
@@ -164,9 +165,9 @@ def main():
         except Exception as exc:
             print(f"Warning: pygame mixer init failed; sound effects disabled. ({exc})")
         else:
-            ding_sound_path = "assets/sounds/ding.wav"
-            if os.path.exists(ding_sound_path):
-                ding_sound = mixer.Sound(ding_sound_path)
+            ding_sound_path = BASE_DIR / "assets" / "sounds" / "ding.wav"
+            if ding_sound_path.exists():
+                ding_sound = mixer.Sound(str(ding_sound_path))
                 ding_sound.set_volume(0.3)
             else:
                 print(f"⚠️ Звук {ding_sound_path} не найден")