Updated

EonaCat.Logger/Servers/Syslog/Syslog.cs

@@ -98,7 +98,7 @@ public class Syslog : IDisposable
             try
             {
                 Udp?.Close();
-                Udp.Dispose();
+                Udp?.Dispose();
             }
             catch
             {
@@ -127,10 +127,20 @@ public class Syslog : IDisposable
 
     private async Task SendAsync(byte[] data)
     {
+        if (data == null)
+        {
+            return;
+        }
+
+        if (Udp == null)
+        {
+            return;
+        }
+
         if (data.Length <= MaxUdpPacketSize)
         {
             // Send via UDP (single packet)
-            await Udp.SendAsync(data, data.Length);
+            await Udp?.SendAsync(data, data.Length);
         }
         else if (SupportsTcp)
         {
@@ -149,6 +159,11 @@ public class Syslog : IDisposable
     /// </summary>
     private static async Task SendViaTcpAsync(Servers.Syslog.Syslog server, byte[] data)
     {
+        if (server == null)
+        {
+            return;
+        }
+
         using var tcpClient = new System.Net.Sockets.TcpClient();
         await tcpClient.ConnectAsync(server.Hostname, server.Port);
         using var stream = tcpClient.GetStream();

EonaCat.Logger/Servers/Udp/Udp.cs

@@ -128,7 +128,7 @@ namespace EonaCat.Logger.Servers.Udp
                     byte[] chunk = new byte[chunkSize];
                     Array.Copy(data, offset, chunk, 0, chunkSize);
 
-                    await _udp.SendAsync(chunk, chunk.Length);
+                    await _udp?.SendAsync(chunk, chunk.Length);
                     offset += chunkSize;
                 }
             }
@@ -160,7 +160,7 @@ namespace EonaCat.Logger.Servers.Udp
                     byte[] chunk = new byte[chunkSize];
                     Array.Copy(sendData, offset, chunk, 0, chunkSize);
 
-                    await _udp.SendAsync(chunk, chunk.Length);
+                    await _udp?.SendAsync(chunk, chunk.Length);
                     offset += chunkSize;
                 }
             }

EonaCat.Logger/Servers/Zabbix/ZabbixRequest.cs

@@ -44,6 +44,11 @@ namespace EonaCat.Logger.Servers.Zabbix
         /// <exception cref="TimeoutException"></exception>
         public async Task<ZabbixResponse> SendAsync(string server, int port = 10051, int timeout = 500)
         {
+            if (string.IsNullOrWhiteSpace(server))
+            {
+                return new ZabbixResponse();
+            }
+
             string json = JsonHelper.ToJson(new ZabbixRequest(Data[0].Host, Data[0].Key, Data[0].Value));
             using (TcpClient tcpClient = new TcpClient(server, port))
             using (NetworkStream stream = tcpClient.GetStream())