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Error : Error: Call to a member function assign() on null

Backtrace:

Errors
Warning: mysqli::__construct(): Persistent connections are disabled. Downgrading to normal in file /class/database/mysqldatabase.php line 64
Warning: preg_match(): Unknown modifier '/' in file /home/www/old.pd/pd_lib/modules/protector/class/protector.php line 1194
Notice: Undefined variable: xoopsTpl in file /modules/articles/index.php line 208
Error: Error: Call to a member function assign() on null in file /modules/articles/index.php line 208

Deprecated

Queries
0.000096 - SET SQL_BIG_SELECTS = 1
0.001601 - SELECT * FROM config WHERE (`conf_modid` = '0' AND `conf_catid` = '1') ORDER BY conf_order ASC
0.000383 - SELECT sess_data, sess_ip FROM session WHERE sess_id = 'aad0769f804146aaeb5bf0f10ca04e15'
0.000374 - SELECT * FROM modules WHERE dirname = 'articles'
0.001590 - SELECT COUNT(*) FROM group_permission WHERE (`gperm_modid` = '1' AND (`gperm_groupid` = '3') AND `gperm_name` = 'module_read' AND `gperm_itemid` = '18')
0.001451 - SELECT * FROM config WHERE (`conf_modid` = '18') ORDER BY conf_order ASC
0.000540 - DELETE FROM protector_access WHERE expire < UNIX_TIMESTAMP()
0.000422 - SELECT COUNT(*) FROM protector_access WHERE ip='3.131.13.37' AND request_uri='/modules/articles/index.php?cat_id=2'
0.000320 - SELECT COUNT(*) FROM protector_access WHERE ip='3.131.13.37'
0.000326 - INSERT INTO protector_access SET ip='3.131.13.37', request_uri='/modules/articles/index.php?cat_id=2', expire=UNIX_TIMESTAMP()+'10'
Total: 10

Blocks
Total: 0

Extra
Included files: 78 files
Memory usage: 695112 bytes

Timers
XOOPS took 0.015 seconds to load.
XOOPS Boot took 0.011 seconds to load.
Module init took 0.004 seconds to load.