fix: add existence check before the _beforeTokenTransfer hook (#844)

Co-authored-by: Jean Cvllr <31145285+CJ42@users.noreply.github.com>
lukso-network · Mar 6, 2024 · cb696c9 · cb696c9
1 parent b6de951
commit cb696c9
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/contracts/LSP8IdentifiableDigitalAsset/LSP8IdentifiableDigitalAssetCore.sol b/contracts/LSP8IdentifiableDigitalAsset/LSP8IdentifiableDigitalAssetCore.sol
@@ -507,6 +507,11 @@ abstract contract LSP8IdentifiableDigitalAssetCore is
             revert LSP8CannotSendToAddressZero();
         }
 
+        // Check that `tokenId` is not already minted
+        if (_exists(tokenId)) {
+            revert LSP8TokenIdAlreadyMinted(tokenId);
+        }
+
         _beforeTokenTransfer(address(0), to, tokenId, data);
 
         // Check that `tokenId` was not minted inside the `_beforeTokenTransfer` hook