WP RSS Aggregator Error

WP RSS Aggregator has encountered a critical error. The safest course of action is to deactivate the plugin and any of its add-ons on this site using the button below. Once you’ve done that, you may reactivate them and start using the plugins again. If the problem persists, please copy the below error and send it to our support team with an explanation of when and how it happened.

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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 /home/customer/www/realmadridnoticias.com/public_html/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 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/src/Entities/Properties/WpraItemSourceProperty.php(85): RebelCode\Entities\Properties\Property->getValue(NULL)
#1 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/lib/Entities/Entity.php(75): RebelCode\Wpra\Core\Entities\Properties\WpraItemSourceProperty->getValue(Object(RebelCode\Entities\Entity))
#2 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/lib/Entities/Entity.php(145): RebelCode\Entities\Entity->get('source_name')
#3 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/src/Data/EntityDataSet.php(94): RebelCode\Entities\Entity->export()
#4 /home/customer/www/realmadridnoticias.com/public_html/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 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/src/Util/IteratorDelegateTrait.php(58): iterator_to_array(Object(RebelCode\Wpra\Core\Data\EntityDataSet))
#7 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/src/Util/IteratorDelegateTrait.php(126): RebelCode\Wpra\Core\Data\AbstractDataSet->yieldIterationValue(Object(RebelCode\Wpra\Core\Data\EntityDataSet))
#8 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Environment.php(497) : eval()'d code(63): RebelCode\Wpra\Core\Data\AbstractDataSet->current()
#9 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(443): __TwigTemplate_b74b30943807db24d8c5406f1877608d32582bfa4be8d4817c4019e2a8078552->doDisplay(Array, Array)
#10 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(414): Twig\Template->displayWithErrorHandling(Array, Array)
#11 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(422): Twig\Template->display(Array)
#12 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Extension/CoreExtension.php(1584): Twig\Template->render(Array)
#13 /home/customer/www/realmadridnoticias.com/public_html/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 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(443): __TwigTemplate_6dc727c2499b5e39ea0af168ab93e8ef1b4321668a150b6a76383d31a5958d2e->doDisplay(Array, Array)
#15 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(414): Twig\Template->displayWithErrorHandling(Array, Array)
#16 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(422): Twig\Template->display(Array)
#17 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/TemplateWrapper.php(47): Twig\Template->render(Array, Array)
#18 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/src/Templates/TwigTemplate.php(67): Twig\TemplateWrapper->render(Array)
#19 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/src/Templates/Feeds/Types/AbstractFeedTemplateType.php(55): RebelCode\Wpra\Core\Templates\TwigTemplate->render(Array)
#20 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/src/Templates/Feeds/MasterFeedsTemplate.php(186): RebelCode\Wpra\Core\Templates\Feeds\Types\AbstractFeedTemplateType->render(Array)
#21 /home/customer/www/realmadridnoticias.com/public_html/wp-content/plugins/wp-rss-aggregator/src/Handlers/FeedShortcode/FeedsShortcodeHandler.php(48): RebelCode\Wpra\Core\Templates\Feeds\MasterFeedsTemplate->render(Array)
#22 /home/customer/www/realmadridnoticias.com/public_html/wp-includes/class-wp-block.php(217): RebelCode\Wpra\Core\Handlers\FeedShortcode\FeedsShortcodeHandler->__invoke(Array, '', Object(WP_Block))
#23 /home/customer/www/realmadridnoticias.com/public_html/wp-includes/blocks.php(720): WP_Block->render()
#24 /home/customer/www/realmadridnoticias.com/public_html/wp-includes/blocks.php(758): render_block(Array)
#25 /home/customer/www/realmadridnoticias.com/public_html/wp-includes/class-wp-hook.php(287): do_blocks('