add try/catch return to margin pulling call

src/Account.sol

@@ -617,6 +617,20 @@ contract Account is IAccount, Auth, OpsReady {
  IPerpsV2MarketConsolidated(_market).transferMargin(_amount);
  }
 
+ /// @notice deposit/withdraw margin to/from a Synthetix PerpsV2 Market
+ /// @param _market: address of market
+ /// @param _amount: amount of margin to deposit/withdraw
+ function _perpsV2ModifyMarginNoExternalRevert(address _market, int256 _amount) internal returns (bool) {
+ if (_amount > 0) {
+ _sufficientMargin(_amount);
+ }
+ try IPerpsV2MarketConsolidated(_market).transferMargin(_amount) {
+ return true;
+ } catch {
+ return false;
+ }
+ }
+
  /// @notice withdraw margin from market back to this account
  /// @dev this will *not* fail if market has zero margin
  function _perpsV2WithdrawAllMargin(address _market) internal {
@@ -657,7 +671,9 @@ contract Account is IAccount, Auth, OpsReady {
 
  /// @dev this will revert if market does not
  /// have sufficient available margin
- _perpsV2ModifyMargin(_market, -int256(difference));
+ bool success = _perpsV2ModifyMarginNoExternalRevert(_market, -int256(difference));
+ /// @dev breakout of fee impose if market reverts (max leverage scenario)
+ if (!success) return;
  }
 
  // impose fee on account from account margin