fix

contracts/DODOVendingMachine/impl/DVM.sol

@@ -31,6 +31,9 @@ contract DVM is DVMTrader, DVMFunding {
         uint256 k,
         bool isOpenTWAP
     ) external {
+        require(!_DVM_INITIALIZED_, "DVM_INITIALIZED");
+        _DVM_INITIALIZED_ = true;
+        
         require(baseTokenAddress != quoteTokenAddress, "BASE_QUOTE_CAN_NOT_BE_SAME");
         _BASE_TOKEN_ = IERC20(baseTokenAddress);
         _QUOTE_TOKEN_ = IERC20(quoteTokenAddress);

contracts/DODOVendingMachine/impl/DVMStorage.sol

@@ -21,6 +21,8 @@ contract DVMStorage is ReentrancyGuard {
 
     bool public _IS_OPEN_TWAP_ = false;
 
+    bool internal _DVM_INITIALIZED_;
+
     // ============ Core Address ============
 
     address public _MAINTAINER_;