The JavaScript exception "invalid Array.prototype.sort argument" occurs when the argument of Array.prototype.sort() isn't either undefined or a function which compares its operands.
TypeError: invalid Array.prototype.sort argument
Message
TypeError: The comparison function must be either a function or undefined (V8-based)
TypeError: invalid Array.prototype.sort argument (Firefox)
TypeError: Array.prototype.sort requires the comparator argument to be a function or undefined (Safari)
Error type
What went wrong?
The argument of Array.prototype.sort() is expected to be either undefined or a function which compares its operands.
Examples
Invalid cases
js
[1, 3, 2].sort(5); // TypeError
Valid cases
js
[1, 3, 2].sort(); // [1, 2, 3]
[1, 3, 2].sort((a, b) => a - b); // [1, 2, 3]
See also
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Array_sort_argument