Notice: Undefined index: src in theme_admin_menu_icon()

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ISSUE : Notice: Undefined index: src in theme_admin_menu_icon() (line 924 of /path/to/drupal/sites/all/modules/contrib/admin_menu/admin_menu.inc).

SOLUTION : This may be caused when you recently update the admin module. You can solve it by going into the database and flush all the "cache" tables like cache blocks, cache_theme etc. just select all the tables with preceding "cache_" name and empty them from phpmyadmin. This will solve your problem