Looking in the code, in function invalidate_pagecaches() in file inc/_core/_misc.func.php, it seems that $servertimenow is not set in the upgrade case.
In 4.1.4, the function used a local variable that was set to the output of time(), as a diff shows.

This diff fixes the problem:

--- b2evolution-4.1.4.orig/blogs/install/_functions_evoupgrade.php	2012-04-03 11:17:56.000000000 -0700
+++ b2evolution-4.1.5/blogs/install/_functions_evoupgrade.php	2012-07-24 12:58:37.463559112 -0700
@@ -242,6 +242,9 @@
 	global $locales, $default_locale;
 	global $DB;
 	global $admin_url;
+	global $servertimenow;
+
+	$servertimenow = time();
 
 	// used for defaults, when upgrading to 1.6
 	global $use_fileupload, $fileupload_allowedtypes, $fileupload_maxk, $doubleCheckReferers;
@@ -3144,4 +3147,4 @@
 /*
  * $Log: _functions_evoupgrade.php,v $
  */

Yep, a nasty error that was fixed in trunk but somehow squeezed into "stable" branch :)

Here's the function from trunk.

function invalidate_pagecaches()
{
	global $DB, $Settings, $servertimenow;

	// get current server time
	$timestamp = ( empty( $servertimenow ) ? time() : $servertimenow );

	// get all blog ids
	if( $blog_ids = $DB->get_col( 'SELECT blog_ID FROM T_blogs' ) )
	{	// build invalidate query
		$query = 'REPLACE INTO T_coll_settings ( cset_coll_ID, cset_name, cset_value ) VALUES';
		foreach( $blog_ids as $blog_id )
		{
			$query .= ' ('.$blog_id.', "last_invalidation_timestamp", '.$timestamp.' ),';
		}
		$query = substr( $query, 0, strlen( $query ) - 1 );
		$DB->query( $query, 'Invalidate blogs\'s page caches' );
	}

	// Invalidate general cache content also
	$Settings->set( 'last_invalidation_timestamp', $timestamp );
	$Settings->dbupdate();
}

I just upgraded and had the same issue.

...so after the error everything seems to be running properly. Do I need to do something?

v4.1.5b fixes that error

...so after the error everything seems to be running properly. Do I need to do something?

Yes, the only problem was in the function mentioned above/

I'm not clear on what exactly I need to do - sorry. I already deleted the install folder as everything seemed to be working - I can re-upload it if needed, but my installation shows the new version 4.1.5 running and I'm not experiencing any errors.

Can you please advise.

...nevermind - I saw and ran the update - everything went through fine. Thnx

Hello,
Updated from 4.12 to 4.15b and get the same error. So what to do? Ignore or change code?

thx for yer time

micha

@micha69

Are you talking about this error?

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '), (4, "last_invalidation_timestamp", ), (5, "last_invalidation_timestamp", ),' at line 1(Errno=1064)
Your query: Invalidate blogs's page caches
REPLACE INTO evo_coll_settings ( cset_coll_ID, cset_name, cset_value )

You should [u]only[/u] see it during install/upgrade.