diff --git a/app/models/reservation.rb b/app/models/reservation.rb
index ccd067d9..1ba61983 100644
--- a/app/models/reservation.rb
+++ b/app/models/reservation.rb
@@ -303,23 +303,25 @@ def logs_tf_url
     "http://logs.tf/search/log?s=#{SITE_HOST}+%23#{id}"
   end
 
+  sig { params(server_info: T.any(ServerInfo::Status, ServerInfo)).returns(T.nilable(T.any(String, ActiveSupport::Multibyte::Chars))) }
   def save_sdr_info(server_info)
     return if server_info.ip.nil?
 
     previous_server_sdr_ip = server&.last_sdr_ip
     previous_server_sdr_port = server&.last_sdr_port&.to_i
 
-    return if previous_server_sdr_ip == server_info.ip && previous_server_sdr_port == server_info.port
+    return if previous_server_sdr_ip == server_info.ip && previous_server_sdr_port == server_info.port && sdr_ip == server_info.ip && sdr_port == server_info.port
 
     update_columns(
       sdr_ip: server_info.ip,
       sdr_port: server_info.port,
-      sdr_tv_port: server_info.port + 1
+      sdr_tv_port: server_info.port.to_i + 1
     )
+
     server&.update_columns(
       last_sdr_ip: server_info.ip,
       last_sdr_port: server_info.port,
-      last_sdr_tv_port: server_info.port + 1
+      last_sdr_tv_port: server_info.port.to_i + 1
     )
 
     broadcast_connect_info