diff --git a/contracts/BlockfuseNFT.sol b/contracts/BlockfuseNFT.sol
index 85932b2..8c71aa1 100644
--- a/contracts/BlockfuseNFT.sol
+++ b/contracts/BlockfuseNFT.sol
@@ -12,18 +12,18 @@ contract BlockfuseNFT is ERC721, Ownable {
         tokenCounter = 0;
     }
 
-    function mint(address to) public {
-        require(!hasMinted[to], "You already own an NFT");
-        hasMinted[to] = true;
+    function mint() public {
+        require(!hasMinted[msg.sender], "You already own an NFT");
+        hasMinted[msg.sender] = true;
         uint256 tokenId = tokenCounter;
-        _safeMint(to, tokenId);
-        tokenCounter += 1;
+        _safeMint(msg.sender, tokenId);
+        tokenCounter = tokenId + 1;
     }
 
     function exists(uint256 tokenId) public view returns (bool) {
-        try this.ownerOf(tokenId) {
+        if this.ownerOf(tokenId) {
             return true;
-        } catch {
+        } else {
             return false;
         }
     }