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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
0.000056 - SET SQL_BIG_SELECTS = 1
0.000673 - SELECT * FROM config WHERE (`conf_modid` = '0' AND `conf_catid` = '1') ORDER BY conf_order ASC
0.000154 - SELECT sess_data, sess_ip FROM session WHERE sess_id = '2b0ae2ce695ef04484637428dbeb0b30'
0.000174 - SELECT * FROM modules WHERE dirname = 'articles'
0.000605 - SELECT COUNT(*) FROM group_permission WHERE (`gperm_modid` = '1' AND (`gperm_groupid` = '3') AND `gperm_name` = 'module_read' AND `gperm_itemid` = '18')
0.000667 - SELECT * FROM config WHERE (`conf_modid` = '18') ORDER BY conf_order ASC
0.000345 - DELETE FROM protector_access WHERE expire < UNIX_TIMESTAMP()
0.017711 - SELECT COUNT(*) FROM protector_access WHERE ip='18.97.14.83' AND request_uri='/modules/articles/index.php?cat_id=3'
0.017651 - SELECT COUNT(*) FROM protector_access WHERE ip='18.97.14.83'
0.000224 - INSERT INTO protector_access SET ip='18.97.14.83', request_uri='/modules/articles/index.php?cat_id=3', expire=UNIX_TIMESTAMP()+'10'
Total: 10

Blocks
Total: 0

Extra
Included files: 78 files
Memory usage: 705632 bytes

Timers
XOOPS took 0.103 seconds to load.
XOOPS Boot took 0.036 seconds to load.
Module init took 0.068 seconds to load.