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SyntaxHighlighter 3.5.1 conflicts with the installed version of presenter #14

JonTheNiceGuy opened this issue Oct 9, 2019 · 1 comment


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@JonTheNiceGuy JonTheNiceGuy commented Oct 9, 2019

SyntaxHighlighter upgraded from 3.5.0 to 3.5.1 last night, and I'm now getting this in my logs:

2019/10/09 09:24:41 [error] 18841#18841: *45326 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Error: Call to undefined method SyntaxHighlighter::output_header_placeholder() in /var/www/
Stack trace:
#0 /var/www/ presenter->head('')
#1 /var/www/ WP_Hook->apply_filters('', Array)
#2 /var/www/ WP_Hook->do_action(Array)
#3 /var/www/ do_action('presenter-head')
#4 /var/www/ include('/var/www/critic...')
#5 /var/www/ include('/var/www/critic...')
#6 /var/www/ require_once('/var/www/critic...')

Note that the line number for the presenter.php is slightly out, as I've added a tweak or two into the lines above, but this is the line in question:


This has been fixed, for now, by disabling the syntax highlighter plugin!

I'll re-check with a clean environment when I'm not due to be giving my presentation in 1hr, but I wanted to log it now in case anyone else has encountered the same issue!


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@aaroncampbell aaroncampbell commented Oct 17, 2019

I just had this problem too, adding the is_callable fixed it for me

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