diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
new file mode 100644
index 0000000..7d8fc6a
--- /dev/null
+++ b/.github/workflows/codecov.yml
@@ -0,0 +1,13 @@
+name: codecov
+"on":
+  push:
+    branches:
+    - main
+jobs:
+  uploader:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v3
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/app/src/lib/History.svelte b/app/src/lib/History.svelte
index a67d7e4..a079724 100644
--- a/app/src/lib/History.svelte
+++ b/app/src/lib/History.svelte
@@ -6,10 +6,6 @@
     import { Link } from "svelte-routing";
   const web3 = new Web3(window.ethereum);
 
-  //let etherscanURL = `https://api.etherscan.io/api?module=logs&action=getLogs&fromBlock=10221728&toBlock=${web3.eth.getBlockNumber()}&address=0x5f0B6625541d613ea33098d2afdE2aE466dbF1ec&topic0=${web3.eth.abi.encodeEventSignature('PassportUpdate(uint256,address,uint8,string,string,string,string,string)')}&topic0_1_opr=and&topic1=${web3.eth.abi.encodeParameter("uint256", tokenId)}&page=1&offset=10&apikey=8GMF6CSE9AW2BQ2T5XZHT5BGJPBQSSY29H`;
-  //console.log(etherscanURL)
-  //fetch(etherscanURL).then((res) => res.json()).then((data) => console.log(data)).catch((err) => console.error(err))
-
   async function getHistory() {
     let history = await contract.getPastEvents("PassportUpdate", {
       filter: {
diff --git a/contract/test/ItemBlocksTest.t.sol b/contract/test/ItemBlocksTest.t.sol
index 9c7d4cf..131c44c 100644
--- a/contract/test/ItemBlocksTest.t.sol
+++ b/contract/test/ItemBlocksTest.t.sol
@@ -35,6 +35,11 @@ contract ItemBlocksTest is Test{
         itemBlocks.safeMint(address(42), 0);
         assertEq(itemBlocks.ownerOf(0), address(42));
     }
+    
+    function testFailSafeMintZeroAddress() public {
+        vm.prank(address(0));
+        itemBlocks.safeMint(address(0), 0);
+    }
 
     // TESTS FOR isEligible
     // should pass because 42 minted token 12