diff --git a/amicleaner/core.py b/amicleaner/core.py
index f4b18ae..b70ff01 100644
--- a/amicleaner/core.py
+++ b/amicleaner/core.py
@@ -119,13 +119,14 @@ def remove_amis(self, amis):
             self.ec2.deregister_image(ImageId=ami.id)
             print("{0} deregistered".format(ami.id))
             for block_device in ami.block_device_mappings:
-                try:
-                    self.ec2.delete_snapshot(
-                        SnapshotId=block_device.snapshot_id
-                    )
-                except ClientError:
-                    failed_snapshots.append(block_device.snapshot_id)
-                print("{0} deleted\n".format(block_device.snapshot_id))
+                if block_device.snapshot_id is not None:
+                    try:
+                            self.ec2.delete_snapshot(
+                                SnapshotId=block_device.snapshot_id
+                            )
+                    except ClientError:
+                        failed_snapshots.append(block_device.snapshot_id)
+                    print("{0} deleted\n".format(block_device.snapshot_id))
 
         return failed_snapshots
 
diff --git a/tests/test_core.py b/tests/test_core.py
index f4a2736..bb0d0f5 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -4,7 +4,7 @@
 from moto import mock_ec2
 
 from amicleaner.core import AMICleaner, OrphanSnapshotCleaner
-from amicleaner.resources.models import AMI, AWSTag
+from amicleaner.resources.models import AMI, AWSTag, AWSBlockDevice
 
 
 def test_map_candidates_with_null_arguments():
@@ -205,6 +205,23 @@ def test_reduce_without_rotation_number():
     assert AMICleaner().reduce_candidates(candidates) == candidates
 
 
+def test_reduce_without_snapshot_id():
+    # creating block device
+    first_block_device = AWSBlockDevice()
+    first_block_device.snapshot_id = None
+
+    # creating tests objects
+    first_ami = AMI()
+    first_ami.id = 'ami-28c2b348'
+    first_ami.name = "ubuntu-20160102"
+    first_ami.block_device_mappings.append(first_block_device)
+
+    # creating amis to drop dict
+    candidates = [first_ami]
+
+    assert AMICleaner().reduce_candidates(candidates) == candidates
+
+
 def test_reduce():
     # creating tests objects
     first_ami = AMI()