1 files changed, 8 insertions, 1 deletions
diff --git a/packages/server/src/helpers/parseBackupFlags.ts b/packages/server/src/helpers/parseBackupFlags.ts
index 0ebddb9..c0a1e99 100644
--- a/packages/server/src/helpers/parseBackupFlags.ts
+++ b/packages/server/src/helpers/parseBackupFlags.ts
@@ -20,10 +20,17 @@ export function parseBackupFlags({ be, bs }: { be: boolean, bs: boolean }): {
   }
 
   if (credentialDeviceType === 'singleDevice' && credentialBackedUp) {
-    throw new Error(
+    throw new InvalidBackupFlags(
       'Single-device credential indicated that it was backed up, which should be impossible.'
     )
   }
 
   return { credentialDeviceType, credentialBackedUp };
 }
+
+class InvalidBackupFlags extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'InvalidBackupFlags';
+  }
+}