WP RSS Aggregator Error

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Error Message:
Argument 1 passed to RebelCode\Entities\Properties\Property::getValue() must implement interface RebelCode\Entities\Api\EntityInterface, null given, called in /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Entities/Properties/WpraItemSourceProperty.php on line 85 (wp-content/plugins/wp-rss-aggregator/lib/Entities/Properties/Property.php:39)
Stack trace:
#0 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Entities/Properties/WpraItemSourceProperty.php(85): RebelCode\Entities\Properties\Property->getValue(NULL)
#1 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/lib/Entities/Entity.php(75): RebelCode\Wpra\Core\Entities\Properties\WpraItemSourceProperty->getValue(Object(RebelCode\Entities\Entity))
#2 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/lib/Entities/Entity.php(145): RebelCode\Entities\Entity->get('source_name')
#3 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Data/EntityDataSet.php(94): RebelCode\Entities\Entity->export()
#4 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Util/IteratorDelegateTrait.php(85): RebelCode\Wpra\Core\Data\EntityDataSet->getIterator()
#5 [internal function]: RebelCode\Wpra\Core\Data\EntityDataSet->rewind()
#6 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Util/IteratorDelegateTrait.php(58): iterator_to_array(Object(RebelCode\Wpra\Core\Data\EntityDataSet))
#7 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Util/IteratorDelegateTrait.php(126): RebelCode\Wpra\Core\Data\AbstractDataSet->yieldIterationValue(Object(RebelCode\Wpra\Core\Data\EntityDataSet))
#8 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Environment.php(497) : eval()'d code(63): RebelCode\Wpra\Core\Data\AbstractDataSet->current()
#9 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(443): __TwigTemplate_52ba4eb1e577a8feb739ee192efdfd0397ce345151feba335122dd0c6437f5bf->doDisplay(Array, Array)
#10 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(414): Twig\Template->displayWithErrorHandling(Array, Array)
#11 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(422): Twig\Template->display(Array)
#12 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Extension/CoreExtension.php(1584): Twig\Template->render(Array)
#13 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Environment.php(497) : eval()'d code(43): twig_include(Object(Twig\Environment), Array, 'feeds/list/feed...')
#14 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(443): __TwigTemplate_84740162f2e77ff400d458c6303496f168ad50666766e07549446844627399e1->doDisplay(Array, Array)
#15 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(414): Twig\Template->displayWithErrorHandling(Array, Array)
#16 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(422): Twig\Template->display(Array)
#17 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/TemplateWrapper.php(47): Twig\Template->render(Array, Array)
#18 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Templates/TwigTemplate.php(67): Twig\TemplateWrapper->render(Array)
#19 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Templates/Feeds/Types/AbstractFeedTemplateType.php(55): RebelCode\Wpra\Core\Templates\TwigTemplate->render(Array)
#20 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Templates/Feeds/MasterFeedsTemplate.php(186): RebelCode\Wpra\Core\Templates\Feeds\Types\AbstractFeedTemplateType->render(Array)
#21 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/plugins/wp-rss-aggregator/src/Handlers/FeedShortcode/FeedsShortcodeHandler.php(48): RebelCode\Wpra\Core\Templates\Feeds\MasterFeedsTemplate->render(Array)
#22 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(343): RebelCode\Wpra\Core\Handlers\FeedShortcode\FeedsShortcodeHandler->__invoke(Array, '', 'wp-rss-aggregat...')
#23 [internal function]: do_shortcode_tag(Array)
#24 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(wp\\-rs...', 'do_shortcode_ta...', '[wp-rss-aggrega...')
#25 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/class-et-builder-element.php(2745): do_shortcode('[wp-rss-aggrega...')
#26 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(343): ET_Builder_Element->_render(Array, '[wp-rss-aggrega...', 'et_pb_code')
#27 [internal function]: do_shortcode_tag(Array)
#28 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(wp\\-rs...', 'do_shortcode_ta...', '[et_pb_text _bu...')
#29 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/main-structure-elements.php(3059): do_shortcode('[et_pb_text _bu...')
#30 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/class-et-builder-element.php(3027): ET_Builder_Column->render(Array, '[et_pb_text _bu...', 'et_pb_column', '', '', '', '')
#31 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(343): ET_Builder_Element->_render(Array, '[et_pb_text _bu...', 'et_pb_column')
#32 [internal function]: do_shortcode_tag(Array)
#33 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(wp\\-rs...', 'do_shortcode_ta...', '[et_pb_column t...')
#34 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/main-structure-elements.php(1882): do_shortcode('[et_pb_column t...')
#35 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/class-et-builder-element.php(3027): ET_Builder_Row->render(Array, '[et_pb_column t...', 'et_pb_row', '', '', '', '')
#36 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(343): ET_Builder_Element->_render(Array, '[et_pb_column t...', 'et_pb_row')
#37 [internal function]: do_shortcode_tag(Array)
#38 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(wp\\-rs...', 'do_shortcode_ta...', '[et_pb_row colu...')
#39 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/main-structure-elements.php(1272): do_shortcode('[et_pb_row colu...')
#40 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/class-et-builder-element.php(3027): ET_Builder_Section->render(Array, '[et_pb_row colu...', 'et_pb_section', '', '', '', '')
#41 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/class-et-builder-element.php(2516): ET_Builder_Element->_render(Array, '[et_pb_row colu...', 'et_pb_section')
#42 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(343): ET_Builder_Element->_render(Array, '[et_pb_row colu...', 'et_pb_section')
#43 [internal function]: do_shortcode_tag(Array)
#44 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(wp\\-rs...', 'do_shortcode_ta...', '[et_pb_section ...')
#45 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/main-structure-elements.php(783): do_shortcode('[et_pb_section ...')
#46 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-content/themes/Divi/includes/builder/class-et-builder-element.php(3027): ET_Builder_Section->render(Array, '[et_pb_row colu...', 'et_pb_section', '', '', '', '')
#47 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(343): ET_Builder_Element->_render(Array, '[et_pb_row colu...', 'et_pb_section')
#48 [internal function]: do_shortcode_tag(Array)
#49 /homepages/15/d804515888/htdocs/clickandbuilds/CDUNEU2020/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(wp\\-rs...', 'do_shortcode_ta...', '
apply_filters('