diff --git a/ChangeLog b/ChangeLog
index 3508cef49..b2774cf95 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,8 @@ $HeadURL: https://phpmyadmin.svn.sourceforge.net/svnroot/phpmyadmin/trunk/phpMyA
 - bug #2905629 [auth] Blowfish secret is not hashed 
 - bug #2910000 [gui] ShowServerInfo should hide all server info from main page 
 - bug #2910568 [structure] Table size for ARCHIVE tables is not displayed 
+- patch #2899969 [core] Session lock blocks working from a second window,
+  thanks to Greg Roach - fisharebest
 
 3.2.4.0 (2009-12-02)
 - bug [engines] Innodb_buffer_pool_pages_latched no longer returned in status 
diff --git a/sql.php b/sql.php
index 87914a85b..eabf89afd 100644
--- a/sql.php
+++ b/sql.php
@@ -294,6 +294,13 @@ if (isset($GLOBALS['show_as_php']) || !empty($GLOBALS['validatequery'])) {
         PMA_DBI_query('SET PROFILING=1;');
     }
 
+    // fisharebest: release the session lock, otherwise we won't be able to run other
+    // scripts until the query has finished (which could take a very long time). 
+    // Note: footer.inc.php writes debug info to $_SESSION, so debuggers will have to wait.
+    if (empty($_SESSION['debug'])) {
+        session_write_close();
+    }
+
     // garvin: Measure query time.
     // TODO-Item http://sourceforge.net/tracker/index.php?func=detail&aid=571934&group_id=23067&atid=377411
     $querytime_before = array_sum(explode(' ', microtime()));