Plugin not working

Plugin is throwing issues since last 6 months. @admin can you help?

An error of type E_ERROR was caused in line 179 of the file /nas/content/live/capify/wp-content/plugins/abn-lookup-for-gravity-forms/abn-lookup-for-gravity-forms.php. Error message: Uncaught Error: Cannot use object of type WP_Error as array in /nas/content/live/capify/wp-content/plugins/abn-lookup-for-gravity-forms/abn-lookup-for-gravity-forms.php:179
Stack trace:
#0 /nas/content/live/capify/wp-content/plugins/abn-lookup-for-gravity-forms/abn-lookup-for-gravity-forms-fields.php(149): ITSG_GF_AbnLookup::do_abnlookup('52651')
#1 /nas/content/live/capify/wp-includes/class-wp-hook.php(305): ITSG_GF_AbnLookup_Fields->check_field_values(Array)
#2 /nas/content/live/capify/wp-includes/plugin.php(189): WP_Hook->apply_filters(Array, Array)
#3 /nas/content/live/capify/wp-content/plugins/gravityforms/gravityforms.php(6745): apply_filters('gform_pre_valid...', Array, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
#4 /nas/content/live/capify/wp-content/plugins/gravityforms/form_display.php(1890): gf_apply_filters('gform_pre_valid...', Array)
#5 /nas/content/live/capify/wp-content/plugins/gravityformspartialentries/class-gf-partial-entries.php(584): GFFormDisplay::validate(Array, Array, '