diff --git a/contracts/sui/mock_dapp/sources/dapp_state.move b/contracts/sui/mock_dapp/sources/dapp_state.move
index 368288988..6c97e2ef4 100644
--- a/contracts/sui/mock_dapp/sources/dapp_state.move
+++ b/contracts/sui/mock_dapp/sources/dapp_state.move
@@ -1,7 +1,7 @@
 module mock_dapp::dapp_state {
     use xcall::xcall_state::IDCap;
     use sui::object::{Self, UID,ID};
-   use sui::vec_map::{Self, VecMap};
+    use sui::vec_map::{Self, VecMap};
     use std::vector::{Self};
     use std::string::{Self,String};
     use xcall::execute_ticket::{Self};
@@ -62,6 +62,9 @@ module mock_dapp::dapp_state {
     }
 
     public fun add_connection(self:&mut DappState,net_id:String,source:String,dest:String,ctx:&mut TxContext){
+        if (vec_map::contains(&self.connections,&net_id)){
+            vec_map::remove(&mut self.connections,&net_id);
+        };
         vec_map::insert(&mut self.connections,net_id,Connection{source,destination:dest});
     }
 
diff --git a/contracts/sui/xcall/sources/centralized_connection/centralized_state.move b/contracts/sui/xcall/sources/centralized_connection/centralized_state.move
index eed644ce7..d562b3200 100644
--- a/contracts/sui/xcall/sources/centralized_connection/centralized_state.move
+++ b/contracts/sui/xcall/sources/centralized_connection/centralized_state.move
@@ -69,6 +69,12 @@ module xcall::centralized_state {
 
     public(package) fun set_fee(self: &mut State, net_id: String, message_fee: u64, response_fee: u64,caller:address) {
         ensure_admin(self,caller);
+        if (vec_map::contains(&self.message_fee,&net_id)){
+            vec_map::remove(&mut self.message_fee,&net_id);
+        };
+        if (vec_map::contains(&self.response_fee,&net_id)){
+            vec_map::remove(&mut self.response_fee,&net_id);
+        };
         vec_map::insert(&mut self.message_fee, net_id, message_fee);
         vec_map::insert(&mut self.response_fee, net_id, response_fee);
     }
diff --git a/contracts/sui/xcall/sources/states/xcall_state.move b/contracts/sui/xcall/sources/states/xcall_state.move
index 51921f474..4e6005db0 100644
--- a/contracts/sui/xcall/sources/states/xcall_state.move
+++ b/contracts/sui/xcall/sources/states/xcall_state.move
@@ -125,6 +125,9 @@ module xcall::xcall_state {
 
 
     public(package) fun set_connection(self:&mut Storage,net_id:String,package_id:String){
+            if (vec_map::contains(&self.connections,&net_id)){
+                vec_map::remove(&mut self.connections,&net_id);
+            };
             vec_map::insert(&mut self.connections,net_id,package_id);
     }