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

Backtrace:
/modules/xfstats/blocks/stats.php (5)
/kernel/block.php (500)
/class/theme_blocks.php (202)
/class/theme_blocks.php (131)
/class/theme_blocks.php (49)
/class/theme.php (389)
/class/theme.php (93)
/header.php (53)
/include/common.php (353)
/mainfile.php (79)
/modules/xfbugreport/index.php (3)