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I've seen this happen once or twice before, but can't remember where or why.

Basically, in one of my page's HTML output, the first line of HTML is returned as 'bool(false)' - On that particular page, I have a function in hook_init() that logs in a user using user_login_finalize(). Here's the HTML from the

page:bool(false)
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML+RDFa 1.1//EN">
<html lang="en" dir="ltr" version="HTML+RDFa 1.1"
  xmlns:content="http://purl.org/rss/1.0/modules/content/"
...

On the page as displayed, I get a blank line above my theme's header with this bool(false) appearing.

On refreshes, that goes away (basically, it only happens when I log in a user programmatically using user_login_finalize()).

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It seems that the problem went away if I commented out the user_module_invoke() call inside user_login_finalize().

Obviously, I didn't want to maintain a patch for that, nor did I want to take out that behavior, as I may want to use hook_user_login() sometime. So, I basically copied user_login_finalize() into my own private function, removed the user_module_invoke() call, and am now using the private function for my particular need. Seems to be working fine!

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    In this way, you are curing the effects, not the cause. As user_login_finalize() doesn't normally create any problem, there must be a third-party module that is the cause of the problem; probably it's a module that implements hook_user_login() in the wrong way.
    – apaderno ♦
    Oct 7, 2011 at 20:05

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