Software error:

isa check for "display_name" failed: undef is not a string! at (eval 72) line 73.
	eval {...} called at (eval 72) line 72
	Delti::Webtracking::Product::new('Delti::Webtracking::Product', 'product_season', undef, 'product_style', undef, 'quantity', 1, 'item_id', 'ZUB-53564', ...) called at Delti/Webtracking/Simple.pm line 87
	Delti::Webtracking::Simple::push_display_items('Delti::Webtracking::Simple=HASH(0x3e1c560)', 'item_id', 'ZUB-53564', 'display_name', undef, 'quantity', 1, 'unit_sales_price', undef, ...) called at Delti/Webtracking/Util.pm line 162
	Delti::Webtracking::Util::tracking_push_displayitem(100, 'ZUB-53564', undef, undef, 'ARRAY(0x4b0f758)', undef, 1, undef) called at ./LibShop/RD-ZUB_main.pl line 170
	require ./LibShop/RD-ZUB_main.pl called at /srv/www/cgi-bin/rzub.pl line 20

For help, please send mail to the webmaster (webmasterswebd8@delti.com), giving this error message and the time and date of the error.

Software error:

[Mon Dec 11 10:37:55 2017] rzub.pl: isa check for "display_name" failed: undef is not a string! at (eval 72) line 73.
[Mon Dec 11 10:37:55 2017] rzub.pl: 	eval {...} called at (eval 72) line 72
[Mon Dec 11 10:37:55 2017] rzub.pl: 	Delti::Webtracking::Product::new('Delti::Webtracking::Product', 'product_season', undef, 'product_style', undef, 'quantity', 1, 'item_id', 'ZUB-53564', ...) called at Delti/Webtracking/Simple.pm line 87
[Mon Dec 11 10:37:55 2017] rzub.pl: 	Delti::Webtracking::Simple::push_display_items('Delti::Webtracking::Simple=HASH(0x3e1c560)', 'item_id', 'ZUB-53564', 'display_name', undef, 'quantity', 1, 'unit_sales_price', undef, ...) called at Delti/Webtracking/Util.pm line 162
[Mon Dec 11 10:37:55 2017] rzub.pl: 	Delti::Webtracking::Util::tracking_push_displayitem(100, 'ZUB-53564', undef, undef, 'ARRAY(0x4b0f758)', undef, 1, undef) called at ./LibShop/RD-ZUB_main.pl line 170
[Mon Dec 11 10:37:55 2017] rzub.pl: 	require ./LibShop/RD-ZUB_main.pl called at /srv/www/cgi-bin/rzub.pl line 20
Compilation failed in require at /srv/www/cgi-bin/rzub.pl line 20.

For help, please send mail to the webmaster (webmasterswebd8@delti.com), giving this error message and the time and date of the error.