2.1.24 [ECMA-ES2017] Section Object.prototype.hasOwnProperty ( V )

V0197: An error is thrown if the argument is a symbol

The specification states: Object.prototype.hasOwnProperty ( V )
     When the hasOwnProperty method is called with argument V, the following steps are 
         1.  Let P be ? ToPropertyKey(V).
         2.  Let O ? be ToObject(this value).
         3.  Return ? HasOwnProperty(O, P).

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In step 1, ToString is invoked instead of ToPropertyKey. Because of this, an error is thrown if V is a symbol.