Fatal error: Out of memory (allocated 246415360) (tried to allocate 24 bytes) in public_html/includes/database.mys

Error:
Fatal error: Out of memory (allocated 246415360) (tried to allocate 24 bytes) in public_html/includes/database.mysqli.inc on line 144, when running cron manualy

Settings:

/public_html/sites/default/setting.php : ini_set('memory_limit', '512M');
php_memory_limit Maximum amount of memory a script may consume (32MB) 512M

Modules:

FeedAPI Inherit
FeedAPI Mapper
FeedAPI
FeedAPI Node
SimplePie parser
Feed Tag Filter
FeedAPI items filter
FeedAPI keyword filter
FeedAPI Language Filter
ImageAPI
ImageAPI GD2
ImageAPI ImageMagick
ImageCache
ImageCache UI

Some backtrace :

# Backtrace:
taxonomy_node_update_index(string)[taxonomy.module:1233];
.taxonomy_nodeapi(string)[node.module:679];
..node_invoke_nodeapi(string)[node.module:1837];
..._node_index_node(a:1:{i:0;O:8:"stdClass":1:{s:3:"nid";s:4:"1047";}})[node.module:1813];
....node_update_index(a:0:{})[?:?];
.....call_user_func_array(a:2:{i:0;s:17:"node_update_index";i:1;a:0:{}})[module.inc:462];
......module_invoke(a:2:{i:0;s:4:"node";i:1;s:12:"update_index";})[search.module:273];
.......search_cron(a:0:{})[?:?];
........call_user_func_array(a:2:{i:0;s:11:"search_cron";i:1;a:0:{}})[module.inc:488];
.........module_invoke_all(a:1:{i:0;s:4:"cron";})[common.inc:2757];
..........drupal_cron_run(a:0:{})[system.admin.inc:1721];
...........system_run_cron(a:0:{})[?:?];
............call_user_func_array(a:2:{i:0;s:15:"system_run_cron";i:1;a:0:{}})[menu.inc:348];
.............menu_execute_active_handler(a:0:{})[index.php:18];
..............index.php
#

Backtrace:
mysqli_real_escape_string(a:2:{i:0;O:6:"mysqli":0:{}i:1;a:1:{i:0;i:0;}})[database.mysqli.inc:323];
.db_escape_string(a:1:{i:0;a:1:{i:0;i:0;}})[database.inc:225];
.._db_query_callback(a:1:{i:0;a:2:{i:0;s:2:"%s";i:1;s:2:"%s";}})[?:?];
...preg_replace_callback(string)[database.mysql-common.inc:41];
....db_query(string)[common.inc:3541];
.....drupal_write_record(string)[taxonomy.module:318];
......taxonomy_save_term(string)[feedapi_mapper_taxonomy.inc:59];
......._feedapi_mapper_create_terms(a:2:{i:0;a:1:{s:39:"http://www.legendarydevils.com/windows/";a:1:{i:0;i:0;}}i:1;i:18;})[feedapi_mapper_taxonomy.inc:32];
........taxonomy_feedapi_mapper(string)[?:?];
.........call_user_func(string)[feedapi_mapper.module:187];
.........._feedapi_mapper_map(string)[feedapi_mapper.module:68];
...........feedapi_mapper_nodeapi(string)[node.module:679];
............node_invoke_nodeapi(string)[node.pages.inc:89];
.............node_object_prepare(string)[feedapi_node.module:368];
.............._feedapi_node_save(string)[?:?];
...............call_user_func_array(string)[feedapi_node.module:231];
................feedapi_node_feedapi_item(string)[?:?];
.................call_user_func_array(string)[module.inc:462];
..................module_invoke(string)[feedapi.module:1259];
..................._feedapi_invoke_refresh(string)[feedapi.module:290];
....................feedapi_invoke(string)[feedapi.module:721];
.....................feedapi_cron(a:0:{})[?:?];
......................call_user_func_array(a:2:{i:0;s:12:"feedapi_cron";i:1;a:0:{}})[module.inc:488];
.......................module_invoke_all(a:1:{i:0;s:4:"cron";})[common.inc:2757];
........................drupal_cron_run(a:0:{})[system.admin.inc:1721];
.........................system_run_cron(a:0:{})[?:?];
..........................call_user_func_array(a:2:{i:0;s:15:"system_run_cron";i:1;a:0:{}})[menu.inc:348];
...........................menu_execute_active_handler(a:0:{})[index.php:18];
............................index.php
#

Backtrace:
htmlspecialchars(a:3:{i:0;a:1:{i:0;i:0;}i:1;i:3;i:2;s:5:"UTF-8";})[bootstrap.inc:858];
.check_plain(a:1:{i:0;a:1:{i:0;i:0;}})[token_taxonomy.inc:29];
..taxonomy_token_values(string)[?:?];
...call_user_func_array(string)[module.inc:488];
....module_invoke_all(string)[token.module:313];
.....token_get_values(string)[pathauto.inc:546];
......pathauto_get_placeholders(string)[pathauto_taxonomy.inc:106];
......._taxonomy_pathauto_alias(string)[pathauto.module:424];
........pathauto_taxonomy(string)[?:?];
.........call_user_func_array(string)[module.inc:488];
..........module_invoke_all(string)[taxonomy.module:362];
...........taxonomy_save_term(string)[feedapi_mapper_taxonomy.inc:59];
............_feedapi_mapper_create_terms(a:2:{i:0;a:1:{s:39:"http://www.legendarydevils.com/windows/";a:1:{i:0;i:0;}}i:1;i:18;})[feedapi_mapper_taxonomy.inc:32];
.............taxonomy_feedapi_mapper(string)[?:?];
..............call_user_func(string)[feedapi_mapper.module:187];
..............._feedapi_mapper_map(string)[feedapi_mapper.module:68];
................feedapi_mapper_nodeapi(string)[node.module:679];
.................node_invoke_nodeapi(string)[node.pages.inc:89];
..................node_object_prepare(string)[feedapi_node.module:368];
..................._feedapi_node_save(string)[?:?];
....................call_user_func_array(string)[feedapi_node.module:231];
.....................feedapi_node_feedapi_item(string)[?:?];
......................call_user_func_array(string)[module.inc:462];
.......................module_invoke(string)[feedapi.module:1259];
........................_feedapi_invoke_refresh(string)[feedapi.module:290];
.........................feedapi_invoke(string)[feedapi.module:721];
..........................feedapi_cron(a:0:{})[?:?];
...........................call_user_func_array(a:2:{i:0;s:12:"feedapi_cron";i:1;a:0:{}})[module.inc:488];
............................module_invoke_all(a:1:{i:0;s:4:"cron";})[common.inc:2757];
.............................drupal_cron_run(a:0:{})[system.admin.inc:1721];
..............................system_run_cron(a:0:{})[?:?];
...............................call_user_func_array(a:2:{i:0;s:15:"system_run_cron";i:1;a:0:{}})[menu.inc:348];
................................menu_execute_active_handler(a:0:{})[index.php:18];
.................................index.php

what can i do for solving the problem?