fix BoringHelperV1 after masterchef end of supply issue

contracts/boringcrypto/BoringHelperV1.sol

@@ -858,7 +858,7 @@ contract BoringHelperV1 is Ownable {
         for (uint256 i = 0; i < pids.length; i++) {
             (uint256 amount, ) = chef.userInfo(pids[i], who);
             pools[i].balance = amount;
-            (uint256 pendingJoe, , , ) = chef.pendingTokens(pids[i], who);
+            uint256 pendingJoe = _pendingTokens(pids[i], who);
             pools[i].pending = pendingJoe;
 
             (address lpToken, , , ) = chef.poolInfo(pids[i]);
@@ -878,4 +878,16 @@ contract BoringHelperV1 is Ownable {
         }
         return pools;
     }
+
+
+    /// @notice Returns the user's pendingTokens for a specific pool of the MasterChef contract
+    /// @param pid The pool id
+    /// @param who The user's address
+    function _pendingTokens(uint256 pid, address who) internal view returns (uint256) {
+        try chef.pendingTokens(pid, who) returns (uint256 pendingJoe, address, string memory, uint256) {
+            return pendingJoe;
+        } catch {
+            return 0;
+        }
+    }
 }

test/foundry/BoringHelperV1.t.sol

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: MIT
+pragma experimental ABIEncoderV2;
+pragma solidity 0.6.12;
+
+import "forge-std/Test.sol";
+
+import "contracts/boringcrypto/BoringHelperV1.sol";
+
+contract testBoringHelperV1 is Test {
+    BoringHelperV1 constant boringHelper = BoringHelperV1(0x1dd4D86180EEe39ac4fB35ECa67CACF608Ab5741);
+
+    function setUp() public {
+        vm.createSelectFork(vm.rpcUrl("avalanche"), 37292546);
+    }
+
+    function test_PollPools() public {
+        uint256[] memory pids = new uint256[](1);
+
+        vm.expectRevert("SafeMath: division by zero");
+        boringHelper.pollPools(address(this), pids);
+
+        BoringHelperV1 newBoringHelper = new BoringHelperV1(
+            boringHelper.chef(),
+            boringHelper.maker(),
+            boringHelper.joe(),
+            boringHelper.WAVAX(),
+            boringHelper.joeFactory(),
+            boringHelper.pangolinFactory(),
+            boringHelper.bar()
+        );
+
+        newBoringHelper.pollPools(address(this), pids);
+    }
+}