React redux action resetting non attached state - reactjs

Question

When triggering an action updateLog, it seems it resets other state items. In my case updateLog should manipulate log and that works just fine. The thing is it also resets tasks to the default values. What am I doing wrong here?
Component:
class Generator extends Component {
render() {
return (
<div className="generator">
<Inputs />
<button onClick={this.generate.bind(this)}>Go!</button>
<Log />
</div>
);
}
generate() {
this.props.updateLog("ANYTHING!");
}
}
function mapStateToProps(state) {
return {
tasks: state.tasks
};
}
function matchDispatchToProps(dispatch){
return bindActionCreators({updateLog: updateLog}, dispatch);
}
export default connect(mapStateToProps, matchDispatchToProps)(Generator);
Action:
export const updateLog = (message) => {
return {
type: 'LOG_UPDATED',
payload: message
}
};
Logreducer:
const initialLog = "";
export default function (state = initialLog, action) {
switch (action.type) {
case 'LOG_UPDATED':
return state + "\n" + action.payload
break;
}
return state;
}
All reducers:
const allReducers = combineReducers({
tasks: taskReducer,
log: logReducer
});
export default allReducers
taskReducer:
export default function (state = null, action) {
switch (action.type) {
case 'TASK_UPDATED':
var tasks = Object.assign({}, action.payload);
return tasks;
break;
}
// Default task properties
return {
CreateDatabaseTask: {
enabled: false,
type: "sqlite"
}
}
}

Answer 1

The problem lies in your task reducer. If the action type matches none of the ones defined in the switch statement, you should return the current state. Instead, you are returning the initial state.
Try changing it to return the current state instead:
const initialState = {
CreateDatabaseTask: {
enabled: false,
type: "sqlite"
}
}
export default function (state = initialState, action) {
switch (action.type) {
case 'TASK_UPDATED':
var tasks = Object.assign({}, action.payload);
return tasks;
break;
default:
return state;
}
}