Use alternative abi for getting symbol for DAI token

.gitignore

@@ -3,4 +3,5 @@ build_webpack/
 build_storybook/
 .DS_Store
 build/
-yarn-error.log
+yarn-error.log
+.env.*

src/logic/tokens/utils/alternativeAbi.js

@@ -0,0 +1,47 @@
+// @flow
+// https://github.com/ethers-io/ethers.js/issues/527
+
+export const ALTERNATIVE_TOKEN_ABI = [
+  {
+    constant: true,
+    inputs: [],
+    name: 'name',
+    outputs: [
+      {
+        name: '',
+        type: 'bytes32',
+      },
+    ],
+    payable: false,
+    stateMutability: 'view',
+    type: 'function',
+  },
+  {
+    constant: true,
+    inputs: [],
+    name: 'symbol',
+    outputs: [
+      {
+        name: '',
+        type: 'bytes32',
+      },
+    ],
+    payable: false,
+    stateMutability: 'view',
+    type: 'function',
+  },
+  {
+    constant: true,
+    inputs: [],
+    name: 'decimals',
+    outputs: [
+      {
+        name: '',
+        type: 'uint8',
+      },
+    ],
+    payable: false,
+    stateMutability: 'view',
+    type: 'function',
+  },
+]

src/routes/safe/components/Transactions/TxsTable/columns.js

@@ -33,7 +33,8 @@ export const getTxAmount = (tx: Transaction) => {
   let txAmount = 'n/a'
 
   if (tx.isTokenTransfer && tx.decodedParams) {
-    txAmount = `${new BigNumber(tx.decodedParams.value).div(10 ** tx.decimals.toNumber()).toString()} ${tx.symbol}`
+    const tokenDecimals = tx.decimals.toNumber ? tx.decimals.toNumber() : tx.decimals
+    txAmount = `${new BigNumber(tx.decodedParams.value).div(10 ** tokenDecimals).toString()} ${tx.symbol}`
   } else if (Number(tx.value) > 0) {
     txAmount = `${fromWei(toBN(tx.value), 'ether')} ${tx.symbol}`
   }

src/routes/safe/store/actions/fetchTransactions.js

@@ -16,6 +16,7 @@ import { getHumanFriendlyToken } from '~/logic/tokens/store/actions/fetchTokens'
 import { isTokenTransfer } from '~/logic/tokens/utils/tokenHelpers'
 import { TX_TYPE_EXECUTION } from '~/logic/safe/transactions'
 import { decodeParamsFromSafeMethod } from '~/logic/contracts/methodIds'
+import { ALTERNATIVE_TOKEN_ABI } from '~/logic/tokens/utils/alternativeAbi'
 
 let web3
 
@@ -59,8 +60,8 @@ export const buildTransactionFrom = async (
   )
   const modifySettingsTx = tx.to === safeAddress && Number(tx.value) === 0 && !!tx.data
   const cancellationTx = tx.to === safeAddress && Number(tx.value) === 0 && !tx.data
-  const customTx = tx.to !== safeAddress && !!tx.data
   const isSendTokenTx = await isTokenTransfer(tx.data, tx.value)
+  const customTx = tx.to !== safeAddress && !!tx.data && !isSendTokenTx
 
   let executionTxHash
   const executionTx = confirmations.find((conf) => conf.type === TX_TYPE_EXECUTION)
@@ -74,8 +75,19 @@ export const buildTransactionFrom = async (
   let decodedParams
   if (isSendTokenTx) {
     const tokenContract = await getHumanFriendlyToken()
-    const tokenInstance = await tokenContract.at(tx.to);
-    [symbol, decimals] = await Promise.all([tokenInstance.symbol(), tokenInstance.decimals()])
+    const tokenInstance = await tokenContract.at(tx.to)
+    try {
+      [symbol, decimals] = await Promise.all([tokenInstance.symbol(), tokenInstance.decimals()])
+    } catch (err) {
+      const alternativeTokenInstance = new web3.eth.Contract(ALTERNATIVE_TOKEN_ABI, tx.to);
+      const [tokenSymbol, tokenDecimals] = await Promise.all([
+        alternativeTokenInstance.methods.symbol().call(),
+        alternativeTokenInstance.methods.decimals().call(),
+      ])
+
+      symbol = web3.utils.toAscii(tokenSymbol)
+      decimals = tokenDecimals
+    }
 
     const params = web3.eth.abi.decodeParameters(['address', 'uint256'], tx.data.slice(10))
     decodedParams = {