diff --git a/app/adminapi/logic/contract/ContractNegotiationLogic.php b/app/adminapi/logic/contract/ContractNegotiationLogic.php
index 13e91ec99..61a56be6a 100644
--- a/app/adminapi/logic/contract/ContractNegotiationLogic.php
+++ b/app/adminapi/logic/contract/ContractNegotiationLogic.php
@@ -45,7 +45,7 @@ class ContractNegotiationLogic extends BaseLogic
     public static function add(array $params): bool
     {
 	    $contract = Contract::field('project_id')->where('id',$params['contract_id'])->findOrEmpty();
-		$profit = $params['negotiation_amount'] - ($params['labor_costs'] + $params['material_costs']);
+		$profit = $params['negotiation_amount'] - (($params['labor_costs']??0) + ($params['material_costs']??0));
 		$profit_rate = $profit / $params['negotiation_amount'];
         Db::startTrans();
         try {
@@ -89,7 +89,7 @@ class ContractNegotiationLogic extends BaseLogic
     public static function edit(array $params): bool
     {
 	    $contract = Contract::field('project_id')->where('id',$params['contract_id'])->findOrEmpty();
-	    $profit = $params['negotiation_amount'] - ($params['labor_costs'] + $params['material_costs']);
+	    $profit = $params['negotiation_amount'] - (($params['labor_costs']??0) + ($params['material_costs']??0));
 	    $profit_rate = $profit / $params['negotiation_amount'];
         Db::startTrans();
         try {