Web Reference: It usually happens when you try to access a property or method on a variable that is undefined. In this detailed guide, you will learn what this error means, why it happens, and how to fix it step by step with simple examples. How to Resolve "TypeError: Cannot read properties of undefined" Error in JavaScript The TypeError: Cannot read properties of undefined is one of the most common errors in JavaScript. It occurs when you try to access a property or call a method on a variable that holds the value undefined. You can't always rely on an object's properties to exist or not exist. If you have something in place that can handle the event that the object is malformed, then you're code is much more efficient and less fragile.
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