2 files changed, 3 insertions, 0 deletions
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 08e592729..e885b0e07 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -297,6 +297,7 @@ export class ExchangeWrapper extends ContractWrapper {
     private async isRoundingErrorAsync(takerTokenAmount: BigNumber.BigNumber,
                                        fillTakerAmount: BigNumber.BigNumber,
                                        makerTokenAmount: BigNumber.BigNumber): Promise<boolean> {
+        await assert.isAnyAddressAvailableAsync(this.web3Wrapper);
         const exchangeInstance = await this.getExchangeContractAsync();
         const isRoundingError = await exchangeInstance.isRoundingError.call(
             takerTokenAmount, fillTakerAmount, makerTokenAmount,
diff --git a/src/contract_wrappers/token_wrapper.ts b/src/contract_wrappers/token_wrapper.ts
index d30645548..945f5caf1 100644
--- a/src/contract_wrappers/token_wrapper.ts
+++ b/src/contract_wrappers/token_wrapper.ts
@@ -25,6 +25,7 @@ export class TokenWrapper extends ContractWrapper {
     public async getBalanceAsync(tokenAddress: string, ownerAddress: string): Promise<BigNumber.BigNumber> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
+        await assert.isAnyAddressAvailableAsync(this.web3Wrapper);
 
         const tokenContract = await this.getTokenContractAsync(tokenAddress);
         let balance = await tokenContract.balanceOf.call(ownerAddress);
@@ -60,6 +61,7 @@ export class TokenWrapper extends ContractWrapper {
     public async getAllowanceAsync(tokenAddress: string, ownerAddress: string, spenderAddress: string) {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
+        await assert.isAnyAddressAvailableAsync(this.web3Wrapper);
 
         const tokenContract = await this.getTokenContractAsync(tokenAddress);
         let allowanceInBaseUnits = await tokenContract.allowance.call(ownerAddress, spenderAddress);