executeSingleOperation - [Network Error]: TypeError: Cannot read property 'hasOwnProperty' of null

[smhumayun]

Hi,

Following is my code based on README.MD:

 async search() {
        try {
            console.log("this.baseURL = " + this.baseURL);
            const response = await this.query(QUERY_SEARCH);
            return response.data.search;
        } catch (error) {
            console.error(error);
        }
    }

But I'm getting following error:

[Network Error]: TypeError: Cannot read property 'hasOwnProperty' of null
{ Error: null
    at CatalogSearchApi.didEncounterError (/Users/syed/WebstormProjects/core-api-base/node_modules/apollo-datasource-graphql/dist/GraphQLDataSource.js:47:31)
    at CatalogSearchApi.executeSingleOperation (/Users/syed/WebstormProjects/core-api-base/node_modules/apollo-datasource-graphql/dist/GraphQLDataSource.js:55:18)
    at process._tickCallback (internal/process/next_tick.js:68:7) extensions: { code: null } }

Any pointers that might help me resolve this issue?