diff --git a/monkey/infection_monkey/network/tcp_scanner.py b/monkey/infection_monkey/network/tcp_scanner.py
index 69a659bf8..5605d5654 100644
--- a/monkey/infection_monkey/network/tcp_scanner.py
+++ b/monkey/infection_monkey/network/tcp_scanner.py
@@ -31,6 +31,7 @@ class TcpScanner(HostScanner, HostFinger):
 
         # maybe hide under really bad detection systems
         target_ports = self._config.tcp_target_ports[:]
+        target_ports = list(filter(None, target_ports))  # remove None values
         shuffle(target_ports)
 
         ports, banners = check_tcp_ports(host.ip_addr, target_ports, self._config.tcp_scan_timeout / 1000.0,