diff --git a/core/server/data/migrations/versions/4.20/05-remove-not-null-constraint-from-portal-title.js b/core/server/data/migrations/versions/4.20/05-remove-not-null-constraint-from-portal-title.js
new file mode 100644
index 0000000000..e333971e1c
--- /dev/null
+++ b/core/server/data/migrations/versions/4.20/05-remove-not-null-constraint-from-portal-title.js
@@ -0,0 +1,41 @@
+const logging = require('@tryghost/logging');
+const {createNonTransactionalMigration} = require('../../utils');
+const {addUnique} = require('../../../schema/commands');
+
+module.exports = createNonTransactionalMigration(
+    async function up(knex) {
+        logging.info('Dropping NOT NULL constraint for: portal_title in table: offers');
+
+        await knex.schema.table('offers', function (table) {
+            table.dropColumn('portal_title');
+        });
+
+        await knex.schema.table('offers', function (table) {
+            table.string('portal_title', 191).nullable();
+        });
+
+        if (knex.client.config.client === 'sqlite3') {
+            for (const column of ['name', 'code', 'stripe_coupon_id']) {
+                await addUnique('offers', column, knex);
+            }
+        }
+    },
+    async function down(knex) {
+        logging.info('Adding NOT NULL constraint for: portal_title in table: offers');
+
+        await knex.schema.table('offers', function (table) {
+            table.dropColumn('portal_title');
+        });
+
+        await knex.schema.table('offers', function (table) {
+            table.string('portal_title', 191).notNullable();
+        });
+
+        if (knex.client.config.client === 'sqlite3') {
+            for (const column of ['name', 'code', 'stripe_coupon_id']) {
+                await addUnique('offers', column, knex);
+            }
+        }
+    }
+);
+
diff --git a/core/server/data/schema/schema.js b/core/server/data/schema/schema.js
index 291f278d87..fd1adc5c68 100644
--- a/core/server/data/schema/schema.js
+++ b/core/server/data/schema/schema.js
@@ -397,7 +397,7 @@ module.exports = {
         discount_amount: {type: 'integer', nullable: false},
         duration: {type: 'string', maxlength: 50, nullable: false},
         duration_in_months: {type: 'integer', nullable: true},
-        portal_title: {type: 'string', maxlength: 191, nullable: false},
+        portal_title: {type: 'string', maxlength: 191, nullable: true},
         portal_description: {type: 'string', maxlength: 2000, nullable: true},
         created_at: {type: 'dateTime', nullable: false},
         updated_at: {type: 'dateTime', nullable: true}
diff --git a/test/unit/server/data/schema/integrity.test.js b/test/unit/server/data/schema/integrity.test.js
index 6a266814e5..3e480ce4fa 100644
--- a/test/unit/server/data/schema/integrity.test.js
+++ b/test/unit/server/data/schema/integrity.test.js
@@ -34,7 +34,7 @@ const validateRouteSettings = require('../../../../../core/server/services/route
  */
 describe('DB version integrity', function () {
     // Only these variables should need updating
-    const currentSchemaHash = '06c1007b471faba9bb82d053f6ba6cc1';
+    const currentSchemaHash = 'e649797a5de92d417744f6f2623c79cf';
     const currentFixturesHash = '07d4b0c4cf159b34344a6b5e88c74e9f';
     const currentSettingsHash = 'aa3fcbc8ab119b630aeda7366ead5493';
     const currentRoutesHash = '3d180d52c663d173a6be791ef411ed01';