diff --git a/ts/sql/migrations/43-gv2-uuid.ts b/ts/sql/migrations/43-gv2-uuid.ts
index 164fccd260f..3f902597179 100644
--- a/ts/sql/migrations/43-gv2-uuid.ts
+++ b/ts/sql/migrations/43-gv2-uuid.ts
@@ -5,7 +5,6 @@ import type { Database } from 'better-sqlite3';
 import { omit } from 'lodash';
 
 import type { LoggerType } from '../../types/Logging';
-import { UUID } from '../../types/UUID';
 import type { UUIDStringType } from '../../types/UUID';
 import { isNotNil } from '../../util/isNotNil';
 import { assert } from '../../util/assert';
@@ -265,11 +264,11 @@ export default function updateToSchemaVersion43(
             }
             changedDetails = true;
 
-            let newValue: UUIDStringType | null = getConversationUuid.get({
+            const newValue: UUIDStringType | null = getConversationUuid.get({
               conversationId: oldValue,
             });
-            if (key === 'inviter') {
-              newValue = newValue ?? UUID.cast(oldValue);
+            if (key === 'inviter' && !newValue) {
+              continue;
             }
             if (!newValue) {
               logger.warn(
@@ -302,12 +301,11 @@ export default function updateToSchemaVersion43(
     }
 
     if (sourceUuid) {
-      const newValue: UUIDStringType =
-        getConversationUuid.get({
-          conversationId: sourceUuid,
-        }) ?? UUID.cast(sourceUuid);
+      const newValue: UUIDStringType | null = getConversationUuid.get({
+        conversationId: sourceUuid,
+      });
 
-      if (newValue !== sourceUuid) {
+      if (newValue) {
         result = {
           ...result,
           sourceUuid: newValue,
diff --git a/ts/test-node/sql_migrations_test.ts b/ts/test-node/sql_migrations_test.ts
index 83b2eb1f736..2546c0b3b3e 100644
--- a/ts/test-node/sql_migrations_test.ts
+++ b/ts/test-node/sql_migrations_test.ts
@@ -769,5 +769,32 @@ describe('SQL migrations test', () => {
         sourceUuid: UUID_A,
       });
     });
+
+    it('should not fail on invalid UUIDs', () => {
+      updateToVersion(42);
+
+      db.exec(
+        `
+        INSERT INTO messages
+          (id, json)
+          VALUES
+          ('m', '${JSON.stringify({
+            id: 'm',
+            sourceUuid: 'ffffffff-ffff-ffff-ffff-ffffffffffff',
+          })}');
+        `
+      );
+
+      updateToVersion(43);
+
+      const { json: messageMJSON } = db
+        .prepare('SELECT json FROM messages WHERE id = "m"')
+        .get();
+
+      assert.deepStrictEqual(JSON.parse(messageMJSON), {
+        id: 'm',
+        sourceUuid: 'ffffffff-ffff-ffff-ffff-ffffffffffff',
+      });
+    });
   });
 });