diff --git a/app.py b/app.py
index 70edf1a..914dc08 100755
--- a/app.py
+++ b/app.py
@@ -51,7 +51,7 @@ def handle_camera_status(status: int):
 class ConnectionTracker:
     def __init__(self):
         self.last_message_time = time.time()
-        self.timeout = 30  # 30-second timeout
+        self.timeout = 15  # 15-second timeout
         self.last_client_ip = None  # Track last connected client IP
 
     def update_last_message_time(self, client_ip=None):
@@ -73,6 +73,7 @@ class ConnectionThread(threading.Thread):
 
     def run(self):
         while self.running:
+            sleep(0.5)
 
             if connection_tracker.last_client_ip:
                 print(f"Checking if last client {connection_tracker.last_client_ip} is still available...")
@@ -211,11 +212,21 @@ if __name__ == '__main__':
         m.msgType = MessageType.MESSAGE_TYPE_IMAGE
         m.image.timestamp = int(ctime.value)
         for bbox in bboxes:
-            box = m.image.boxes.add()
-            box.x = bbox[0]
-            box.y = bbox[1]
-            box.w = bbox[2]
-            box.h = bbox[3]
+            # Check if bbox is not None and has exactly 4 elements
+            if bbox is not None and len(bbox) == 4:
+                # Check if all elements in bbox are not None
+                if all(element is not None for element in bbox):
+                    box = m.image.boxes.add()
+                    box.x = bbox[0]
+                    box.y = bbox[1]
+                    box.w = bbox[2]
+                    box.h = bbox[3]
+                else:
+                    # Skip if any element in bbox is None
+                    pass
+            else:
+                # Skip if bbox is None or does not have exactly 4 elements
+                pass
         m.image.camType = id_
         if isDetection:
             m.image.trackMode = TrackMode.TRACK_MODE_DETECT