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.
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: Cannot read properties of undefined (reading 'x') (V8-based) TypeError: null has no properties (Firefox) TypeError: undefined has no properties (Firefox) TypeError: undefined is not an object (evaluating 'undefined.x') (Safari)
null.foo; // TypeError: null has no properties undefined.bar; // TypeError: undefined has no properties
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/No_properties