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[DigiBooks]

Oh, wait. I forgot that ZC 1.5.1 doesn't give as much resolution detail as more recent if not modern versions of ZC. If the issue is related to a SQL query, then will need to install mydebug backtrace in order to get some useful information about the problem.

I'm testing this on a newly installed V1.5.5 - that's where I am getting the error message. This is what the error log reads:

[04-Feb-2019 20:04:58 Europe/London] Request URI: /db_155/index.php?main_page=index&cPath=31, IP address: 81.154.21.188
#1 mysqli_query() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/classes/db/mysql/query_factory.php:45]
#2 queryFactory->query() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/classes/db/mysql/query_factory.php:261]
#3 queryFactory->Execute() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/functions/functions_categories.php:159]
#4 zen_get_subcategories() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/functions/functions_categories.php:164]
#5 zen_get_subcategories() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/modules/categories_tabs.php:33]
#6 include(/home/sites/digibooks.org.uk/public_html/db_155/includes/modules/categories_tabs.php) called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/template_default/templates/tpl_modules_categories_tabs.php:14]
#7 require(/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/template_default/templates/tpl_modules_categories_tabs.php) called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/responsive_classic/common/tpl_header.php:133]
#8 require(/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/responsive_classic/common/tpl_header.php) called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/responsive_classic/common/tpl_main_page.php:119]
#9 require(/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home/sites/digibooks.org.uk/public_html/db_155/index.php:97]

[04-Feb-2019 20:04:58 Europe/London] PHP Warning: mysqli_query(): (HY000/2008): Out of memory in /home/sites/digibooks.org.uk/public_html/db_155/includes/classes/db/mysql/query_factory.php on line 45
[04-Feb-2019 20:04:58 Europe/London] Request URI: /db_155/index.php?main_page=index&cPath=31, IP address: 81.154.21.188
#1 trigger_error() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/classes/db/mysql/query_factory.php:171]
#2 queryFactory->show_error() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/classes/db/mysql/query_factory.php:143]
#3 queryFactory->set_error() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/classes/db/mysql/query_factory.php:270]
#4 queryFactory->Execute() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/functions/functions_categories.php:159]
#5 zen_get_subcategories() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/functions/functions_categories.php:164]
#6 zen_get_subcategories() called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/modules/categories_tabs.php:33]
#7 include(/home/sites/digibooks.org.uk/public_html/db_155/includes/modules/categories_tabs.php) called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/template_default/templates/tpl_modules_categories_tabs.php:14]
#8 require(/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/template_default/templates/tpl_modules_categories_tabs.php) called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/responsive_classic/common/tpl_header.php:133]
#9 require(/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/responsive_classic/common/tpl_header.php) called at [/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/responsive_classic/common/tpl_main_page.php:119]
#10 require(/home/sites/digibooks.org.uk/public_html/db_155/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home/sites/digibooks.org.uk/public_html/db_155/index.php:97]

[04-Feb-2019 20:04:58 Europe/London] PHP Fatal error: 2008:Out of memory :: select categories_id
from categories
where parent_id = '6122' ==> (as called by) /home/sites/digibooks.org.uk/public_html/db_155/includes/functions/functions_categories.php on line 159 <== in /home/sites/digibooks.org.uk/public_html/db_155/includes/classes/db/mysql/query_factory.php on line 171
[04-Feb-2019 20:04:58 Europe/London] PHP Fatal error: Out of memory (allocated 15466496) (tried to allocate 2787 bytes) in /home/sites/digibooks.org.uk/public_html/db_155/includes/classes/db/mysql/query_factory.php on line 171