diff --git a/ai/ai_simulations.py b/ai/ai_simulations.py
index 1fd9bd3..6c024f7 100644
--- a/ai/ai_simulations.py
+++ b/ai/ai_simulations.py
@@ -17,8 +17,6 @@ def simulate_attack(self):
             return
 
         try:
-            if not self.scenarios:
-                raise IndexError("No scenarios available.")
             scenario = random.choice(self.scenarios)
             print(f"[SIMULATION] Executing simulated attack: {scenario}")
 
diff --git a/app.py b/app.py
index 940d53a..8e0689f 100644
--- a/app.py
+++ b/app.py
@@ -71,20 +71,19 @@
 
 
 async def random_url(_):
-    retries = 3
-    for _ in range(retries):
-        try:
-            pet = random.choice(["cat", "dog"])
-            api_url = f"https://api.the{pet}api.com/v1/images/search"
-            async with aiohttp.ClientSession() as session:
-                async with session.get(api_url) as resp:
-                    resp.raise_for_status()
-                    return (await resp.json())[0]["url"]
-        except aiohttp.ClientError as e:
-            logging.error(f"API request failed: {e}")
-        except Exception as e:
-            logging.error(f"Unexpected error: {e}")
-    return None
+    try:
+        pet = random.choice(["cat", "dog"])
+        api_url = f"https://api.the{pet}api.com/v1/images/search"
+        async with aiohttp.ClientSession() as session:
+            async with session.get(api_url) as resp:
+                resp.raise_for_status()
+                return (await resp.json())[0]["url"]
+    except aiohttp.ClientError as e:
+        logging.error(f"API request failed: {e}")
+        return None
+    except Exception as e:
+        logging.error(f"Unexpected error: {e}")
+        return None
 
 
 @pn.cache
@@ -270,7 +269,7 @@ async def process_inputs(class_names: List[str], image_url: str):
     macos_control = MacOSControl()
     linux_control = LinuxControl()
     android_control = AndroidControl()
-    ios_control = iOSControl()
+    ios_control = IOSControl()
     advanced_device_control = AdvancedDeviceControl()
     code_parser = CodeParser("sample_code")
     pipeline_manager = PipelineManager()
diff --git a/backend/ai_chat.py b/backend/ai_chat.py
index 169979b..af6112e 100644
--- a/backend/ai_chat.py
+++ b/backend/ai_chat.py
@@ -21,6 +21,9 @@ def openai_chat(self, prompt):
             openai.api_key = self.openai_key
             response = openai.Completion.create(engine="text-davinci-003", prompt=prompt, max_tokens=100)
             return response.choices[0].text.strip()
+        except openai.error.AuthenticationError as e:
+            logging.error(f"Authentication error during OpenAI chat: {e}")
+            return "Authentication error"
         except Exception as e:
             logging.error(f"Error during OpenAI chat: {e}")
             return ""