TypeError: Cannot read property '0' of undefined

[harryharihar]

I am using FlatList under renderItem Method <DynamicTabView data={this.state.data} renderTab={this._renderItem} defaultIndex={this.state.defaultIndex} containerStyle={styles.container} headerBackgroundColor={"white"} headerTextStyle={styles.headerText} onChangeTab={this.onChangeTab} headerUnderlayColor={"blue"} />