diff --git a/redfish_utilities/managers.py b/redfish_utilities/managers.py
index 3bb4648..5291150 100644
--- a/redfish_utilities/managers.py
+++ b/redfish_utilities/managers.py
@@ -187,7 +187,7 @@ def print_manager(manager):
         if property in manager.dict:
             prop_val = manager.dict[property]
             if isinstance(prop_val, list):
-                prop_val = ", ".join(prop_val)
+                prop_val = ", ".join([i for i in prop_val if i is not None])
             elif property == "Status":
                 prop_val = "State: {}, Health: {}".format(prop_val.get("State", "N/A"), prop_val.get("Health", "N/A"))
             print(manager_line_format.format(property, prop_val))
@@ -514,11 +514,9 @@ def print_manager_network_protocol(network_protocol):
             if property == "NTP":
                 # For NTP, extract the servers; need to skip "empty" slots potentially
                 if "NTPServers" in network_protocol.dict[property]:
-                    other_str = []
-                    for server in network_protocol.dict[property]["NTPServers"]:
-                        if isinstance(server, str):
-                            other_str.append(server)
-                    other_str = "NTP Servers: " + ", ".join(other_str)
+                    other_str = "NTP Servers: " + ", ".join(
+                        [i for i in network_protocol.dict[property]["NTPServers"] if i is not None]
+                    )
             print(
                 network_protocol_line_format.format(
                     property,
@@ -690,7 +688,7 @@ def print_manager_ethernet_interface(interface):
         if property in interface.dict:
             prop_val = interface.dict[property]
             if isinstance(prop_val, list):
-                prop_val = ", ".join(prop_val)
+                prop_val = ", ".join([i for i in prop_val if i is not None])
             elif property == "Status":
                 prop_val = "State: {}, Health: {}".format(prop_val.get("State", "N/A"), prop_val.get("Health", "N/A"))
             print(interface_line_format.format(property, prop_val))
diff --git a/redfish_utilities/power_equipment.py b/redfish_utilities/power_equipment.py
index 53b0d37..1ff8e15 100644
--- a/redfish_utilities/power_equipment.py
+++ b/redfish_utilities/power_equipment.py
@@ -403,7 +403,7 @@ def print_power_equipment(power_equipment):
         if property in power_equipment["Info"].dict:
             prop_val = power_equipment["Info"].dict[property]
             if isinstance(prop_val, list):
-                prop_val = ", ".join(prop_val)
+                prop_val = ", ".join([i for i in prop_val if i is not None])
             elif property == "Status":
                 prop_val = "State: {}, Health: {}".format(prop_val.get("State", "N/A"), prop_val.get("Health", "N/A"))
             print(power_equipment_line_format.format(property, prop_val))
@@ -534,7 +534,7 @@ def print_power_equipment_electrical(electrical):
         if property in electrical.dict:
             prop_val = electrical.dict[property]
             if isinstance(prop_val, list):
-                prop_val = ", ".join(prop_val)
+                prop_val = ", ".join([i for i in prop_val if i is not None])
             elif property == "PhaseWiringType":
                 prop_val = str(phase_wiring_type_strings.get(prop_val, prop_val))
             elif property == "NominalVoltage":
diff --git a/redfish_utilities/systems.py b/redfish_utilities/systems.py
index 4cc06ae..8ab678b 100644
--- a/redfish_utilities/systems.py
+++ b/redfish_utilities/systems.py
@@ -476,7 +476,7 @@ def print_virtual_media(virtual_media_list):
             if property in virtual_media:
                 prop_val = virtual_media[property]
                 if isinstance(prop_val, list):
-                    prop_val = ", ".join(prop_val)
+                    prop_val = ", ".join([i for i in prop_val if i is not None])
                 print(virtual_media_line_format.format("", property, prop_val))
         print("")