[wp-trac] [WordPress Trac] #54230: Block based widgeteditor can't update "Not a valid JSON response"

[WordPress Trac]

#54230: Block based widgeteditor can't update "Not a valid JSON response"
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 Reporter:  davidlarssonback   |       Owner:  (none)
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Widgets            |     Version:  5.8.1
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:  rest-api
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Comment (by sabbirshouvo):

 @davidlarssonback are you using any shortcode inside widgets? If yes then
 please check if any of the shortcodes `echo` anything instead of return.
 If `echo` or output anything then the error will happen. Shortcodes should
 always return content.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54230#comment:3>
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