Solution :
I have understood your question and I can help you in fixing your error.
I think your myDB object is returned as empty in your component lifecycle. You are fetching your data from a server, and your operates in a API lifecycle but your component is getting rendered before you have your data in myDB object. So it is currently empty and the {myDB.title} in a return is returning as undefined.
So the solution is as below :
let myDB = this.props.myDB || {}
It will return a empty myDB object after that after fetching your data to a myDB object your component will surely re-render it and {myDB.title} in your return will be displayed a title as expected.