diff --git a/db_scripts/diff/15381.up b/db_scripts/diff/15381.up
new file mode 100644
index 00000000..bcdd7c95
--- /dev/null
+++ b/db_scripts/diff/15381.up
@@ -0,0 +1,4 @@
+use provisioning;
+
+delete v from voip_usr_preferences v join voip_preferences a on v.attribute_id = a.id
+  where a.attribute="lock" and (v.value is null or v.value="0" or length(trim(v.value)) = 0);