fatal error on abi.decode with dynamic type

[ldct]

Description
Solium reports fatal error on abi.decode with dynamic type

Steps to reproduce

Using the following solidity file:

pragma solidity 0.5.7;
pragma experimental "ABIEncoderV2";

contract Decoder {
  function interpret(bytes memory input) public {
    uint256[] memory ret = abi.decode(input, (uint256[]));
  }
}

➜  default-apps git:(ldct/transfer) ✗ yarn run solium -f contracts/default-apps/Decoder.sol
yarn run v1.13.0
$ /Users/xuanji/gits/cf/monorepo/packages/contracts/node_modules/.bin/solium -f contracts/default-apps/Decoder.sol
✖ [Fatal error] An error occured while linting over contracts/default-apps/Decoder.sol:
Cannot read property 'type' of null
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Expected behavior
Since solc successfully compiles this file, solium should not exit with a fatal error; either lint the file or report a rule violation.

Operating System
MacOS

Linter version
1.2.4

➜  default-apps git:(ldct/transfer) ✗ yarn run solium --version
yarn run v1.13.0
$ /Users/xuanji/gits/cf/monorepo/packages/contracts/node_modules/.bin/solium --version
Solium version 1.2.4
✨  Done in 0.56s.

[duaraghav8]

Thanks for reporting @IIIIllllIIIIllllIIIIllllIIIIllllIIIIll
I'm able to reproduce this, will ship the fix in the next release.

[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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