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-rw-r--r--src/contract_wrappers/exchange_wrapper.ts2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 5d4c21154..106c8774c 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -601,7 +601,7 @@ export class ExchangeWrapper extends ContractWrapper {
const bignumberWrappingEventCallback = (err: Error, event: ContractEvent) => {
if (_.isNull(err)) {
const wrapIfBigNumber = (value: ContractEventArg): ContractEventArg => {
- return value instanceof String ? value : new BigNumber(value);
+ return _.isString(value) ? value : new BigNumber(value);
};
event.args = _.mapValues(event.args, wrapIfBigNumber);
}