Warning message when trying execute onHide on unmounted component

[caiorios]

Steps to reproduce the issue:

1. Create a toaster with state inside a simple View.
2. Run an event (clicking on a button for example).
3. On event created, set the state with the desired message.
4. After the message shows up on screen, exit the component (back button on navigator for example).
5. After a while, a warning message shows up:

Warning: Can only update a mounted or mounting component. This usually means you called setState, replaceState, or forceUpdate on an unmounted component. This is a no-op.

Example code to reproduce the issue:

constructor(props) {
	super(props);
	this.state = {
		toast: {}
	};
}
submitAction() {
	if (this.formIsNotValid) {
		this.setState({
			toast: {
			  text: 'The form is not valid!',
			  styles: ToastStyles.error
			}
		  });
	}
}
renderMessage() {
	if (!_.isEmpty(this.state.toast)) {
		return <Toaster message={this.state.toast} />;
    }
    return <View />;
}
render() {
	return (
		<View>
			{this.renderMessage()}
			<TouchableOpacity
				style={s.buttonContainer}
				onPress={() => this.submitAction()}>
				<Text style={s.button}>Submit</Text>
			</TouchableOpacity>
		</View>
	)
}

package.json:

"dependencies": {
    "lodash": "^4.17.4",
    "moment": "^2.18.1",
    "react": "16.0.0-alpha.12",
    "react-native": "0.48.2",
    "react-native-camera": "^0.10.0",
    "react-native-config": "^0.7.0",
    "react-native-datepicker": "^1.6.0",
    "react-native-fs": "^2.8.1",
    "react-native-htmlview": "^0.12.0",
    "react-native-image-gallery": "^2.0.0",
    "react-native-navigation": "^1.1.228",
    "react-native-tab-view": "0.0.69",
    "react-native-toaster": "^1.1.2",
    "react-native-vector-icons": "^4.3.0",
    "react-redux": "^5.0.6",
    "redux": "^3.7.2",
    "redux-thunk": "^2.2.0"
  }