A PHP error was encountered

Message:

strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated

Location:

/home/flirtuser/domains/flirtmee.nl/public_html/mobile-detect/Mobile_Detect.php on line 1581

Trace:

#1 [internal function]: {closure}()
#2 /home/flirtuser/domains/flirtmee.nl/public_html/mobile-detect/Mobile_Detect.php(1581): strpos()
#3 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/templates/breezy/header.php(4): parse_user_agent()
#4 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/system/core/codebreeder/view.php(171): include('...')
#5 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/application/core/view.php(666): CodeBreeder_View::load()
#6 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/application/views/users/old_view.php(1): View::load()
#7 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/system/core/codebreeder/view.php(171): include('...')
#8 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/application/core/view.php(666): CodeBreeder_View::load()
#9 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/application/controllers/users.php(193): View::load()
#10 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/system/core/codebreeder/codebreeder.php(194): Users_Controller->view()
#11 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/system/core/codebreeder/codebreeder.php(85): CodeBreeder_Core::execute()
#12 /home/flirtuser/domains/flirtmee.nl/public_html/profiel/index.php(115): CodeBreeder_Core::initialize()
#13 {main}