#399

backend/app/representations/post_repr.rb

@@ -69,7 +69,12 @@ module PostRepr
     return nil unless post.thumbnail.attached?
 
     Rails.application.routes.url_helpers.rails_blob_url(post.thumbnail, only_path: false)
-  rescue
+  rescue ActionController::UrlGenerationError, ArgumentError, URI::InvalidURIError => e
+    Rails.logger.warn(
+        "PostRepr.thumbnail_url failed post_id=#{post.id} " \
+        "attachment_id=#{post.thumbnail.attachment&.id} " \
+        "blob_id=#{post.thumbnail.blob&.id} " \
+        "error_class=#{e.class} message=#{e.message}")
     nil
   end
 end