diff --git a/src/vmm_mad/remotes/vcenter/detach_disk b/src/vmm_mad/remotes/vcenter/detach_disk
index 5750610581..887b1eb05c 100755
--- a/src/vmm_mad/remotes/vcenter/detach_disk
+++ b/src/vmm_mad/remotes/vcenter/detach_disk
@@ -62,6 +62,6 @@ begin
                                          ds_name,
                                          img_path)
 rescue Exception => e
-    STDERR.puts "Error detaching image #{img_path} size. Reason: #{e.message}"
+    STDERR.puts "Error detaching image #{img_path}. Reason: #{e.message}"
     exit -1
 end
diff --git a/src/vmm_mad/remotes/vcenter/vcenter_driver.rb b/src/vmm_mad/remotes/vcenter/vcenter_driver.rb
index 6b567a4038..48bd996cb3 100644
--- a/src/vmm_mad/remotes/vcenter/vcenter_driver.rb
+++ b/src/vmm_mad/remotes/vcenter/vcenter_driver.rb
@@ -2650,6 +2650,7 @@ private
         ds_and_img_name = "[#{ds_name}] #{img_path}"
 
         disk  = vm.config.hardware.device.select { |d| is_disk?(d) &&
+                                 d.backing.respond_to?(:fileName) &&
                                  d.backing.fileName == ds_and_img_name }
 
         raise "Disk #{img_path} not found." if disk.nil?