Add checks

render.js

@@ -223,7 +223,9 @@ const UI = {
         Elem('activity-object-actor-icon').innerHTML = '<img src="' + activity.object.actor.iconUrl(Icons.fallback['user']) + '" width="48" height="48" />'
         Elem('activity-object-actor-display-name').innerText = activity.object.actor.displayName()
         Elem('activity-object-actor-address').innerText = activity.object.actor.address()
-        Elem('activity-object-actor-address').href = activity.object.actor.data.id
+        if (activity.object.actor.data) {
+          Elem('activity-object-actor-address').href = activity.object.actor.data.id
+        }
         Elem('activity-object-to').innerHTML = activity.object.to.map(
           function(element) {
             return '<li class="actor-display">' + Render.audienceActor(element) + '</li>'

src/activity-object.js

@@ -33,14 +33,16 @@ ActivityObject.prototype = {
       function (load_ok, failure_message) {
         if (load_ok) {
           // Actor
-          this.actor.loadFromASActor(this.data.attributedTo, function (ok, error) {
-            if (ok) {
-              // Store actors in KnownActors
-              KnownActors.set(this.actor.data.id, this.actor)
-            } else {
-              console.log(error)
-            }
-          }.bind(this))
+          if (this.data.attributedTo) {
+            this.actor.loadFromASActor(this.data.attributedTo, function (ok, error) {
+              if (ok) {
+                // Store actors in KnownActors
+                KnownActors.set(this.actor.data.id, this.actor)
+              } else {
+                console.log(error)
+              }
+            }.bind(this))
+          }
           // attachment
           this.attachments = (this.data.attachment && Array.isArray(this.data.attachment)) ? this.data.attachment : []
           // Audience