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+
+# Risk
+Low
+
+# Title
+The input argument `_tokenid` is not checked if it is valid in `AuctionDemo.sol` contract
+
+## Impact
+In the functions: `participateToAuction()`, `returnHighestBid()`, `returnHighestBidder()`, `claimAuction()`, `cancelBid()`, `cancelAllBids()` and `returnBids()` in `AuctionDemo.sol` contract the input argument `_tokenid` is not checked if it is a valid token id.
+Add a check in all functions in the contract `AuctionDemo.sol` that the `_tokenid` is valid.
+
+## Links
+https://github.com/code-423n4/2023-10-nextgen/blob/8b518196629faa37eae39736837b24926fd3c07c/smart-contracts/AuctionDemo.sol#L57
+https://github.com/code-423n4/2023-10-nextgen/blob/8b518196629faa37eae39736837b24926fd3c07c/smart-contracts/AuctionDemo.sol#L65
+https://github.com/code-423n4/2023-10-nextgen/blob/8b518196629faa37eae39736837b24926fd3c07c/smart-contracts/AuctionDemo.sol#L87
+https://github.com/code-423n4/2023-10-nextgen/blob/8b518196629faa37eae39736837b24926fd3c07c/smart-contracts/AuctionDemo.sol#L104
+https://github.com/code-423n4/2023-10-nextgen/blob/8b518196629faa37eae39736837b24926fd3c07c/smart-contracts/AuctionDemo.sol#L124
+https://github.com/code-423n4/2023-10-nextgen/blob/8b518196629faa37eae39736837b24926fd3c07c/smart-contracts/AuctionDemo.sol#L134
+https://github.com/code-423n4/2023-10-nextgen/blob/8b518196629faa37eae39736837b24926fd3c07c/smart-contracts/AuctionDemo.sol#L147
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