A PHP error was encountered

Message:

Undefined index: data_birthday

Location:

/home/italiand/public_html/application/views/users/elements/picture.php on line 21

Trace:

#1 /home/italiand/public_html/application/views/users/elements/picture.php(21): {closure}(8, 'Undefined index...', '/home/italiand/...', 21, Array)
#2 /home/italiand/public_html/system/core/codebreeder/view.php(171): include('/home/italiand/...')
#3 /home/italiand/public_html/application/core/view.php(659): CodeBreeder_View::load('users/elements/...', Array, false, 'users/elements/...')
#4 /home/italiand/public_html/application/views/timeline/actions.php(8): View::load('users/elements/...', Array)
#5 /home/italiand/public_html/system/core/codebreeder/view.php(171): include('/home/italiand/...')
#6 /home/italiand/public_html/application/core/view.php(659): CodeBreeder_View::load('timeline/action...', Array, false, 'timeline/action...')
#7 /home/italiand/public_html/application/views/timeline/helpers/timeline.php(18): View::load('timeline/action...', Array)
#8 /home/italiand/public_html/system/core/codebreeder/view.php(171): include('/home/italiand/...')
#9 /home/italiand/public_html/application/core/view.php(655): CodeBreeder_View::load('timeline/helper...', Array, 1, 'timeline/helper...')
#10 /home/italiand/public_html/application/helpers/timeline/timeline.php(143): View::load('timeline/helper...', Array, 1)
#11 /home/italiand/public_html/application/controllers/users.php(85): Timeline_Helper::getTimeline(Array, 1)
#12 /home/italiand/public_html/system/core/codebreeder/codebreeder.php(194): Users_Controller->view()
#13 /home/italiand/public_html/system/core/codebreeder/codebreeder.php(85): CodeBreeder_Core::execute()
#14 /home/italiand/public_html/index.php(99): CodeBreeder_Core::initialize(Array)
#15 {main}