diff --git a/lib/www/server/lib/db/plan/patch.js b/lib/www/server/lib/db/plan/patch.js
index 0146a6f..d324f14 100644
--- a/lib/www/server/lib/db/plan/patch.js
+++ b/lib/www/server/lib/db/plan/patch.js
@@ -1,4 +1,5 @@
 const { setSurvey, transaction } = require('../connection');
+const { getLineName } = require('./lib');
 
 async function patch (projectId, sequence, payload, opts = {}) {
 	const client = await setSurvey(projectId);
@@ -25,6 +26,15 @@ async function patch (projectId, sequence, payload, opts = {}) {
 
 		await client.query(text, values);
 
+		// Magic – if the name is (strictly) null or empty, we generate a new one
+		if (p.name === null || p.name === "") {
+			const text = "SELECT * FROM planned_lines WHERE sequence = $1;";
+			const res = await client.query(text, [p.sequence||sequence]);
+			const row = res.rows[0];
+			const name = await getLineName(client, projectId, row);
+			await client.query("UPDATE planned_lines SET name = $2 WHERE sequence = $1", [p.sequence||sequence, name]);
+		}
+
 		transaction.commit(client);
 	} catch (err) {
 		transaction.rollback(client);