I keep getting this notice, intermittently, when clicking on node gallery images:

Array to string conversion in drupal_send_headers() (line 1237 of /drupal/master/includes/bootstrap.inc).

Anyone have any idea what this is?

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SomebodySysop created an issue.

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SomebodySysop CreditAttribution: SomebodySysop commented

Found a temporary work-around solution here: https://www.drupal.org/node/2482933#comment-10265949

Apparently it is caused by image.module not receiving data in expected format. Unknown if the issue can be resolved with node gallery by changes to node gallery.