fix i9

src/Vault.sol

@@ -230,7 +230,7 @@ contract Vault is IVault, ERC4626, ERC20Permit {
         currentLosses = _calculateLockedLosses() + (assets - loan);
         latestRepay = block.timestamp;
 
-        IERC20(asset()).safeTransfer(receiver, assets);
+        if (assets > 0) IERC20(asset()).safeTransfer(receiver, assets);
 
         emit Borrowed(receiver, assets);
 
@@ -265,7 +265,7 @@ contract Vault is IVault, ERC4626, ERC20Permit {
         // the vault is not responsible for any payoff
         // slither-disable-next-line arbitrary-send-erc20
         // super.totalAssets() += assets and never overflows by definition
-        IERC20(asset()).safeTransferFrom(repayer, address(this), assets);
+        if (assets > 0) IERC20(asset()).safeTransferFrom(repayer, address(this), assets);
 
         emit Repaid(repayer, assets, debt);
     }

src/services/credit/CallOption.sol

@@ -209,7 +209,7 @@ contract CallOption is CreditService {
             toBorrow = toTransfer - redeemed > freeLiquidity ? freeLiquidity : toTransfer - redeemed;
         }
         // We will always have ithil.balanceOf(address(this)) >= toCall, so the following succeeds
-        ithil.safeTransfer(ownerAddress, toCall);
+        if (toCall > 0) ithil.safeTransfer(ownerAddress, toCall);
         // repay the user's losses
         if (toBorrow > 0 && freeLiquidity > 0) manager.borrow(agreement.loans[0].token, toBorrow, 0, ownerAddress);
     }

src/services/debit/GmxService.sol

@@ -119,7 +119,7 @@ contract GmxService is AuctionRateModel, DebitService {
         totalRewards = toTransfer < newRewards ? newRewards - toTransfer : 0;
         totalCollateral -= agreement.collaterals[0].amount;
         // Transfer weth: since toTransfer <= totalWithdraw
-        weth.safeTransfer(msg.sender, toTransfer);
+        if (toTransfer > 0) weth.safeTransfer(msg.sender, toTransfer);
     }
 
     function wethReward(uint256 tokenID) public view returns (uint256) {