diff --git a/src/models/pnid.ts b/src/models/pnid.ts
index d3f4bd8..28124b7 100644
--- a/src/models/pnid.ts
+++ b/src/models/pnid.ts
@@ -90,10 +90,7 @@ const PNIDSchema = new Schema<IPNID, PNIDModel, IPNIDMethods>({
 	},
 	devices: [DeviceSchema],
 	identification: { // * user identification tokens
-		email_code: {
-			type: String,
-			unique: true
-		},
+		email_code: String,
 		email_token: {
 			type: String,
 			unique: true
@@ -290,4 +287,4 @@ PNIDSchema.method('clearPermission', function clearPermission(flag: PNIDPermissi
 	this.permissions &= ~flag;
 });
 
-export const PNID = model<IPNID, PNIDModel>('PNID', PNIDSchema);
+export const PNID = model<IPNID, PNIDModel>('PNID', PNIDSchema);