diff --git a/src/Application/Migrations/18_function_ticket_dependency_missing.sql b/src/Application/Migrations/18_function_ticket_dependency_missing.sql
index c54286a..393e40f 100644
--- a/src/Application/Migrations/18_function_ticket_dependency_missing.sql
+++ b/src/Application/Migrations/18_function_ticket_dependency_missing.sql
@@ -6,7 +6,7 @@ SET ROLE TO postgres;
 -- returns true if:
 --   - given ID is an encoding ticket
 --   - given ID's profile does have a dependency
---   - that dependency is not met in the given ID's project
+--   - no encoding ticket among the given ID's sibling tickets has that dependee profile
 -- In all other cases, including the cases where this check does not
 -- make any sense, it will return false.
 
@@ -37,7 +37,7 @@ BEGIN
 	WHERE
 		depender.id = param_depender_ticket_id;
 
-	RETURN result;
+	RETURN COALESCE(result, false);
 
 END
 $$
diff --git a/src/Application/Migrations/__2019-01-03_fix-dependee-ticket-missing.sql b/src/Application/Migrations/__2019-01-03_fix-dependee-ticket-missing.sql
new file mode 100644
index 0000000..046f3c4
--- /dev/null
+++ b/src/Application/Migrations/__2019-01-03_fix-dependee-ticket-missing.sql
@@ -0,0 +1,38 @@
+BEGIN;
+
+SET ROLE TO postgres;
+
+CREATE OR REPLACE FUNCTION ticket_dependee_missing(param_depender_ticket_id bigint)
+  RETURNS boolean AS
+  $$
+DECLARE
+	result boolean;
+BEGIN
+
+	SELECT
+		epv.id IS NOT NULL -- check this is actually an encoding ticket
+		AND ep.depends_on IS NOT NULL -- check that this is a ticket of a depending profile
+		AND dependee.id IS NULL -- this is the error condition to return true on
+		INTO result
+	FROM
+		tbl_ticket depender
+	LEFT JOIN
+		tbl_encoding_profile_version epv ON epv.id = depender.encoding_profile_version_id
+	LEFT JOIN
+		tbl_encoding_profile ep ON epv.encoding_profile_id = ep.id
+	LEFT JOIN
+		tbl_encoding_profile ep2 ON ep2.id = ep.depends_on
+	LEFT JOIN
+		tbl_encoding_profile_version epv2 ON epv2.encoding_profile_id = ep2.id
+	LEFT JOIN
+		tbl_ticket dependee ON dependee.encoding_profile_version_id = epv2.id AND dependee.parent_id = depender.parent_id
+	WHERE
+		depender.id = param_depender_ticket_id;
+
+	RETURN COALESCE(result, false);
+
+END
+$$
+LANGUAGE plpgsql;
+
+COMMIT;