WP RSS Aggregator Error

<b>WP RSS Aggregator</b> 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: 
RebelCode\Entities\Properties\Property::getValue(): Argument #1 ($entity) must be of type RebelCode\Entities\Api\EntityInterface, null given, called in /home/wp873345/2chmeshi.net/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/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/src/Entities/Properties/WpraItemSourceProperty.php(85): RebelCode\Entities\Properties\Property->getValue(NULL)
#1 /home/wp873345/2chmeshi.net/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/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/lib/Entities/Entity.php(145): RebelCode\Entities\Entity->get('source_name')
#3 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/src/Data/EntityDataSet.php(94): RebelCode\Entities\Entity->export()
#4 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/src/Util/IteratorDelegateTrait.php(86): RebelCode\Wpra\Core\Data\EntityDataSet->getIterator()
#5 [internal function]: RebelCode\Wpra\Core\Data\EntityDataSet->rewind()
#6 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/src/Util/IteratorDelegateTrait.php(58): iterator_to_array(Object(RebelCode\Wpra\Core\Data\EntityDataSet))
#7 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/src/Util/IteratorDelegateTrait.php(130): RebelCode\Wpra\Core\Data\AbstractDataSet->yieldIterationValue(Object(RebelCode\Wpra\Core\Data\EntityDataSet))
#8 /home/wp873345/2chmeshi.net/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/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(453): __TwigTemplate_9273351622a66a94867aaada9939b993b7a64f68af2a2de49b72e7bb6c1e1b05->doDisplay(Array, Array)
#10 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array)
#11 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(432): Twig\Template->display(Array)
#12 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Extension/CoreExtension.php(1607): Twig\Template->render(Array)
#13 /home/wp873345/2chmeshi.net/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/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(453): __TwigTemplate_7a4ffc8e4c6aa0cbdeed012478893132e0c864e0c260164253da33d4e50ded11->doDisplay(Array, Array)
#15 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array)
#16 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/Template.php(432): Twig\Template->display(Array)
#17 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/vendor/twig/twig/src/TemplateWrapper.php(47): Twig\Template->render(Array, Array)
#18 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/src/Templates/TwigTemplate.php(59): Twig\TemplateWrapper->render(Array)
#19 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/src/Templates/Feeds/Types/AbstractFeedTemplateType.php(41): RebelCode\Wpra\Core\Templates\TwigTemplate->render(Array)
#20 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/src/Templates/Feeds/MasterFeedsTemplate.php(172): RebelCode\Wpra\Core\Templates\Feeds\Types\AbstractFeedTemplateType->render(Array)
#21 /home/wp873345/2chmeshi.net/public_html/wp-content/plugins/wp-rss-aggregator/src/Handlers/FeedShortcode/FeedsShortcodeHandler.php(48): RebelCode\Wpra\Core\Templates\Feeds\MasterFeedsTemplate->render(Array)
#22 /home/wp873345/2chmeshi.net/public_html/wp-includes/class-wp-block.php(463): RebelCode\Wpra\Core\Handlers\FeedShortcode\FeedsShortcodeHandler->__invoke(Array, '', Object(WP_Block))
#23 /home/wp873345/2chmeshi.net/public_html/wp-includes/class-wp-block.php(443): WP_Block->render()
#24 /home/wp873345/2chmeshi.net/public_html/wp-includes/blocks.php(1705): WP_Block->render()
#25 /home/wp873345/2chmeshi.net/public_html/wp-includes/blocks.php(1743): render_block(Array)
#26 /home/wp873345/2chmeshi.net/public_html/wp-includes/class-wp-hook.php(326): do_blocks('<!-- wp:widget-...')
#27 /home/wp873345/2chmeshi.net/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('<!-- wp:widget-...', Array)
#28 /home/wp873345/2chmeshi.net/public_html/wp-includes/widgets/class-wp-widget-block.php(78): apply_filters('widget_block_co...', '<!-- wp:widget-...', Array, Object(WP_Widget_Block))
#29 /home/wp873345/2chmeshi.net/public_html/wp-includes/class-wp-widget.php(394): WP_Widget_Block->widget(Array, Array)
#30 /home/wp873345/2chmeshi.net/public_html/wp-includes/widgets.php(837): WP_Widget->display_callback(Array, Array)
#31 /home/wp873345/2chmeshi.net/public_html/wp-content/themes/diver/single.php(15): dynamic_sidebar('single-top-widg...')
#32 /home/wp873345/2chmeshi.net/public_html/wp-includes/template-loader.php(106): include('/home/wp873345/...')
#33 /home/wp873345/2chmeshi.net/public_html/wp-blog-header.php(19): require_once('/home/wp873345/...')
#34 /home/wp873345/2chmeshi.net/public_html/index.php(17): require('/home/wp873345/...')
#35 {main}