Web Reference: 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. This error happens when you attempt to use a variable or object that hasn't been properly initialized or doesn't exist. Undefined means that a variable has been declared but has not been assigned a value, or you're trying to access a property that doesn't exist on an object. In JavaScript, properties and functions can only belong to objects. Since ... 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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