Typing a parenthesis permanently breaks the tags field

[Jayshua]

Describe the bug
When typing the "(" character into the tags field this error message completely replaces the field. It requires a page-refresh to bring the field back.

To Reproduce
Steps to reproduce the behavior:

1. Go to a panel page that uses the tags field.
2. Try entering an opening parenthesis into the the filed.
3. Watch the field disappear as a red info box unexpectedly replaces it. I'm pretty sure the red is the blood shed by the tags field after the info box violently slew it with a Katana. Never trust that info box.

Expected behavior
The field shouldn't disappear. Nor should the evil info box be summoned.

Kirby Version
3.1.1

Console output

SyntaxError: "unterminated parenthetical"
    search http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/app.js:1
    type http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/app.js:1
    input http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/app.js:1
    ie http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/vendor.js:39
    n http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/vendor.js:39
    _wrapper http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/vendor.js:39
app.js:1:152920
    errorCaptured http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/app.js:1
    re http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/vendor.js:39
    ie http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/vendor.js:39
    n http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/vendor.js:39
    _wrapper http://localhost:8080/media/panel/d9e15b7599116e38f870d0dc600c08a4/js/vendor.js:39

Desktop (please complete the following information):

• OS: Windows 10
• Browser Firefox
• Version 66.0.3

[distantnative]

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