AJAX error - Runtime Error in component "EnsEMBL::Web::Component::Gene::TranscriptsImage [content]"

Function EnsEMBL::Web::Component::Gene::TranscriptsImage fails to execute due to the following error:

	Can't call method "Obj" on an undefined value at
	... /usr/local/ensembl-live/modules/EnsEMBL/Web/Component/Gene/TranscriptsImage.pm line 21.