diff --git a/lib/net_base.rb b/lib/net_base.rb
index 9aef0c5..51be339 100644
--- a/lib/net_base.rb
+++ b/lib/net_base.rb
@@ -63,6 +63,10 @@ class NetBase
     # // TTTTTTTT
     # // TTTTTTTT
     # // TTTTTTTT
+    if @s.nil?
+      puts "Error: no active socket"
+      return
+    end
     flags_bits = PacketFlags.new(opts).bits
     ack = @ack
     ip = @ip
diff --git a/lib/teeworlds_client.rb b/lib/teeworlds_client.rb
index ba20ca7..19224ab 100644
--- a/lib/teeworlds_client.rb
+++ b/lib/teeworlds_client.rb
@@ -191,8 +191,9 @@ class TeeworldsClient
 
   def disconnect
     puts 'disconnecting.'
-    send_ctrl_close
+    send_ctrl_close unless @s.nil?
     @s&.close
+    @s = nil
     @signal_disconnect = true
   end