Incompatibility with aThemes Sydney Pro’s Customizer
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Hey @fabiorino,
we just noted a problem with Crelly Slider on the Customizer page of (at least) aThemes’ “Sydney Pro” theme.
When we try to load this theme’s customizer page we get a white screen with the following PHP warning:
Warning: Cannot modify header information - headers already sent by (output started at /[SERVERPATH]/wp-content/plugins/crelly-slider/wordpress/admin.php:188) in /[SERVERPATH]/wp-admin/customize.php on line 126
And then it depends on the PHP version if…
a) PHP 5.6, 7.0, 7.1, 7.2: the customizer gets loaded anyway and overlays the warning so the message isn’t visible anymore
OR
b) PHP 7.3: the screen stays white and only shows the PHP warning.
In case b) if you press F5 to reload the page then again a white page loads with the PHP message but the customizer’s HTML seems to be loaded without any CSS or something looking like that. The page is totally screwed up then.
If we disable the Crelly Slider plugin then all is fine – even in PHP 7.3.
What can we do?
PS: WordPress is 5.3.2, MySQL is 5.7.28, Crelly Slider is 1.3.5, Sydney Pro is 2.0.15 (latest version)
Many greetings,
– doffine
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