diff --git a/app/Models/Activity.php b/app/Models/Activity.php
index 4fcdebda..83ff01ef 100644
--- a/app/Models/Activity.php
+++ b/app/Models/Activity.php
@@ -151,7 +151,7 @@ class Activity extends Model {
 
     public function getThumbnailUrlAttribute()
     {
-        if (!is_null($this->resource))
+        if (is_null($this->resource))
             return "/images/icons/profile_small.png";
 
         switch ($this->resource_type) {