PHP Fatal error: Uncaught TypeError: Cannot access offset of type string on string in Stack trace:\n#0 [internal function]: img_caption_shortcode()

You’re mis-using the caption shortcode here

<a href="http://example.com"><img src="https://example.com/example.jpg" /></a> test

You can fix it by adding a width option, which is required per the official documentation

<a href="http://example.com"><img src="https://example.com/example.jpg" /></a> test

In any case, this is also likely a bug in WordPress (misusing a shortcode shouldn’t result in a PHP Fatal Error). See the following bug report:

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