diff --git a/libqmpbackup/vm.py b/libqmpbackup/vm.py
index 1e7c2fb..3e44827 100644
--- a/libqmpbackup/vm.py
+++ b/libqmpbackup/vm.py
@@ -96,6 +96,8 @@ def get_block_devices(blockinfo, argv, excluded_disks, included_disks, uuid):
                         log.info("Ceph device found, using image name")
                         filename = encoded_name["file"]["image"]
                         log.debug("RBD image name: [%s]", filename)
+                    else:
+                        raise KeyError
                 except KeyError:
                     log.debug("Non RBD Device detected, use filename setting.")
                     try: