diff --git a/WHATS_NEW b/WHATS_NEW
index 5938a994b..2dea99cbd 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.135 - 
 ====================================
+  Issue error if external_device_info_source=udev and udev db record incomplete.
   Fix passing of 32bit values through daemons (mostly lvmlockd).
   Use local memory pool for whole alloc_handle manipulation.
   Add missing pointer validation after dm_get_next_target().
diff --git a/lib/device/dev-ext.c b/lib/device/dev-ext.c
index 8f2024e92..22e9a6dda 100644
--- a/lib/device/dev-ext.c
+++ b/lib/device/dev-ext.c
@@ -60,6 +60,12 @@ static struct dev_ext *_dev_ext_get_udev(struct device *dev)
 	if (!(udev_device = udev_device_new_from_devnum(udev, 'b', dev->dev)))
 		return_NULL;
 
+	if (!udev_device_get_is_initialized(udev_device)) {
+		/* Timeout or some other udev db inconsistency! */
+		log_error("Udev database has incomplete information about device %s.", dev_name(dev));
+		return NULL;
+	}
+
 	dev->ext.handle = (void *) udev_device;
 	return &dev->ext;
 #else