TypeError when using React: Cannot read property 'firstChild' of undefined
Uncaught TypeError: Cannot read property 'firstChild' of undefined in React, React-Bootstrap
JavaScript firstChild returns undefined React - TypeError: Cannot read property 'map' of undefined javascript Uncaught TypeError: Cannot read property 'firstChild' of null TypeError: Cannot read property 'sortingLevel' of undefined TypeError: Cannot read property 'textToBePresentInElementValue' of undefined TypeError: Cannot read property 'latestTimestamp' of undefined TypeError Cannot read property of undefined Javascript: firstChild object returns undefined TypeError: Cannot read property of undefined TypeError: Cannot read property 'map' of undefined react component Uncaught TypeError: Cannot read property 'firstChild' of null (Google maps failing to load) TypeError: Cannot read property 'prepareStyles' of undefined TypeError: Cannot read property 'setZoomLevelLimits' of undefined get firstChild of div TypeError: Cannot read property 'map' of undefined React Js TypeError: Cannot read property 'notesObjectInService' of undefined javascript typeError: cannot read property of undefined typeError: Cannot read property 'tigerStart' of undefined Uncaught TypeError: Cannot read property 'firstChild' of null error message JavaScript cannot get firstChild React Promise: TypeError: Cannot read property 'then' of undefined React Promise - TypeError: Cannot read property 'then' of undefined TypeError: Cannot read property 'length' of undefined when I add element to array TypeError: Cannot read property 'name' of undefined TypeError: Cannot read property 'toBeA' of undefined Uncaught TypeError: undefined is not a function for "onclick="this.firstChild.play()" TypeError: Cannot read property 'firstChild' of undefined While rendering the react page server side Why does firstChild not return the first element? React Js TypeError: Cannot read property 'LoginAuth' of undefined