Same issue here, in my case it’s because this plugin depends on the theme’s gallery formatting and not all themes implement gallery view the same or properly.
twitterfeed.php can be modified to include something similar to
if (isset($post->entities->media[0])) {
$media_url = $post->entities->media[0]->media_url;
$p['picture'] = $media_url;
}
and it will start adding images to the twitter posts which do have images. I need to read up a bit to see if this will cause issues with video but I’m under the impression it doesn’t.
I’m really late on this but it’s line 94 of im-social-aggregator.php that causes this issue
add_theme_support('post-thumbnails', array($this->post_type));
I removed it and it seems to be fix this problem but I’ll need to look into it more, a lot of this plugin needs quite an overhaul.