diff --git a/lib/Segments/SubscribersFinder.php b/lib/Segments/SubscribersFinder.php
index 5500a4c142..3b8ecc52ba 100644
--- a/lib/Segments/SubscribersFinder.php
+++ b/lib/Segments/SubscribersFinder.php
@@ -21,6 +21,9 @@ class SubscribersFinder {
     $result = array();
     foreach ($newsletter_segments_ids as $segment_id) {
       $segment = Segment::findOne($segment_id);
+      if (!$segment instanceof Segment) {
+        continue; // skip deleted segments
+      }
       $result = array_merge($result, $this->findSubscribersInSegment($segment, $subscribers_to_process_ids));
     }
     return $this->unique($result);
diff --git a/tests/integration/Segments/SubscribersFinderTest.php b/tests/integration/Segments/SubscribersFinderTest.php
index f3ddc7c837..9a7d0e3d37 100644
--- a/tests/integration/Segments/SubscribersFinderTest.php
+++ b/tests/integration/Segments/SubscribersFinderTest.php
@@ -56,7 +56,8 @@ class SubscribersFinderTest extends \MailPoetTest {
 
   function testFindSubscribersInSegmentInSegmentDefaultSegment() {
     $finder = new SubscribersFinder();
-    $subscribers = $finder->findSubscribersInSegments(array($this->subscriber_2->id), array($this->segment_1->id));
+    $deleted_segment_id = 1000; // non-existent segment
+    $subscribers = $finder->findSubscribersInSegments(array($this->subscriber_2->id), array($this->segment_1->id, $deleted_segment_id));
     expect($subscribers)->count(1);
     expect($subscribers[$this->subscriber_2->id])->equals($this->subscriber_2->id);
   }