diff --git a/branches/ucs-4.0/ucs-4.0-4/virtualization/univention-virtual-machine-manager-daemon/src/univention/uvmm/node.py b/branches/ucs-4.0/ucs-4.0-4/virtualization/univention-virtual-machine-manager-daemon/src/univention/uvmm/node.py
index 9f7aad5..7c98936 100644
--- a/branches/ucs-4.0/ucs-4.0-4/virtualization/univention-virtual-machine-manager-daemon/src/univention/uvmm/node.py
+++ b/branches/ucs-4.0/ucs-4.0-4/virtualization/univention-virtual-machine-manager-daemon/src/univention/uvmm/node.py
@@ -345,7 +345,7 @@ class Domain(PersistentCached):
                        driver = disk.find('driver')
                        if driver is not None:
                                dev.driver = driver.attrib.get('name')  # optional
-                               dev.driver_type = driver.attrib['type']
+                               dev.driver_type = driver.attrib.get('type', '')  # optional
                                dev.driver_cache = driver.attrib.get('cache', '')  # optional
                        source = disk.find('source')
                        if source is not None: