The JavaScript exception "null (or undefined) has no properties" occurs when you attempt to access properties of null and undefined. They don't have any.
TypeError: "x" has no properties
Message
TypeError: Unable to get property {x} of undefined or null reference (Edge) TypeError: null has no properties (Firefox) TypeError: undefined has no properties (Firefox)
Error type
What went wrong?
Examples
null and undefined have no properties
null.foo; // TypeError: null has no properties undefined.bar; // TypeError: undefined has no properties
See also
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/No_properties
