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"}
/>