1 files changed, 4 insertions, 0 deletions
diff --git a/src/contract_wrappers/token_wrapper.ts b/src/contract_wrappers/token_wrapper.ts
index d3ef5d6cf..1ad1cd9d6 100644
--- a/src/contract_wrappers/token_wrapper.ts
+++ b/src/contract_wrappers/token_wrapper.ts
@@ -205,6 +205,10 @@ export class TokenWrapper extends ContractWrapper {
      */
     public async subscribeAsync(tokenAddress: string, eventName: TokenEvents, subscriptionOpts: SubscriptionOpts,
                                 indexFilterValues: IndexedFilterValues): Promise<ContractEventEmitter> {
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
+        assert.doesBelongToStringEnum('eventName', eventName, TokenEvents);
+        assert.doesConformToSchema('subscriptionOpts', subscriptionOpts, subscriptionOptsSchema);
+        assert.doesConformToSchema('indexFilterValues', indexFilterValues, indexFilterValuesSchema);
         const tokenContract = await this._getTokenContractAsync(tokenAddress);
         let createLogEvent: CreateContractEvent;
         switch (eventName) {