System error

error:  Can't use an undefined value as an ARRAY reference at /var/www/deertensor.net/b/_serve_entry_single_page.comp line 46.
context: 
... 
42:  <a href="/b/<% $scan %>" class="non_hover"><img class="type_scan" src="/b/<% $scan %>" alt="<% $data_hash->{title} %>" style="display: block; margin-left: auto; margin-right: auto;"></a>
43:  % } # foreach END
44: 
45:  <ul class="under_row ">
46:  <li class="tags ">Tags: <% join(', ', @{$data_hash->{tags}}) %></li>
47:  % if (exists $data_hash->{shortcode}) {
48:  <li class="shortcode "><a href="http://d4t6.net/<% $data_hash->{shortcode} %>">d4t6.net/<% $data_hash->{shortcode} %></a></li>
49:  % } # if END
50:  <li class="typed_on">Getippt auf meiner <% $data_hash->{typed_on} %></li>
... 
code stack:  /var/www/deertensor.net/b/_serve_entry_single_page.comp:46
/var/www/deertensor.net/b/dhandler:26
raw error






























Can't use an undefined value as an ARRAY reference at /var/www/deertensor.net/b/_serve_entry_single_page.comp line 46.


Trace begun at /usr/share/perl5/HTML/Mason/Exceptions.pm line 125
HTML::Mason::Exceptions::rethrow_exception('Can\'t use an undefined value as an ARRAY reference at /var/www/deertensor.net/b/_serve_entry_single_page.comp line 46.^J') called at /var/www/deertensor.net/b/_serve_entry_single_page.comp line 46
HTML::Mason::Commands::__ANON__('ress_filepath_json', '/var/www/deertensor.net/_content/2017_01_17__67A4.json') called at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x7f9184058f78)', 'ress_filepath_json', '/var/www/deertensor.net/_content/2017_01_17__67A4.json') called at /usr/share/perl5/HTML/Mason/Request.pm line 1302
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1292
HTML::Mason::Request::comp(undef, undef, 'ress_filepath_json', '/var/www/deertensor.net/_content/2017_01_17__67A4.json') called at /var/www/deertensor.net/b/dhandler line 26
HTML::Mason::Commands::__ANON__ at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x7f91840586f0)') called at /usr/share/perl5/HTML/Mason/Request.pm line 1300
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1292
HTML::Mason::Request::comp(undef, undef, undef) called at /usr/share/perl5/HTML/Mason/Request.pm line 481
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 481
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 433
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0x7f918404d098)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 165
HTML::Mason::Request::ApacheHandler::exec('HTML::Mason::Request::ApacheHandler=HASH(0x7f918404d098)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 831
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0x563330198440)', 'Apache2::RequestRec=SCALAR(0x7f9184056928)') called at /etc/perl/DeerTensorNetMason.pm line 174
DeerTensorNetMason::handler('Apache2::RequestRec=SCALAR(0x7f9184056928)') called at -e line 0
eval {...} at -e line 0