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Error: mdb->get_record() found more than one record!

line 1691 of /lib/dml/moodle_database.php: call to debugging()
line 1651 of /lib/dml/moodle_database.php: call to moodle_database->get_record_sql()
line 1630 of /lib/dml/moodle_database.php: call to moodle_database->get_record_select()
line 3382 of /lib/moodlelib.php: call to moodle_database->get_record()
line 435 of /lib/rsslib.php: call to get_user_key()
line 85 of /lib/rsslib.php: call to rss_get_token()
line 66 of /lib/rsslib.php: call to rss_get_url()
line 160 of /blocks/news_items/block_news_items.php: call to rss_get_link()
line 337 of /blocks/moodleblock.class.php: call to block_news_items->get_content()
line 231 of /blocks/moodleblock.class.php: call to block_base->formatted_contents()
line 1231 of /lib/blocklib.php: call to block_base->get_content_for_output()
line 1289 of /lib/blocklib.php: call to block_manager->create_block_contents()
line 377 of /lib/blocklib.php: call to block_manager->ensure_content_created()
line 4118 of /lib/outputrenderers.php: call to block_manager->region_has_content()
line 53 of /theme/boost/layout/drawers.php: call to core_renderer->blocks()
line 1477 of /lib/outputrenderers.php: call to include()
line 1403 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
line 94 of /my/courses.php: call to core_renderer->header()

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