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Tested in Safari 12 and Safari Technology Preview 12.1.
In the console I see:
[Error] SyntaxError: JSON Parse error: Unexpected identifier "undefined" parse (linter.js:345:255) (anonymous function) (linter.js:345:255) s (linter.js:1:259) e (linter.js:1:427) Global Code (linter.js:1:444)