I added a row directly into the database, table Customer, in way to have system acocunt 'BackgroundTask' and
'SearchEngine'
INSERT [Customer] ([CustomerGuid], [Username], [Email], [EmailToRevalidate], [AdminComment], [IsTaxExempt], [AffiliateId], [VendorId], [HasShoppingCartItems], [RequireReLogin], [FailedLoginAttempts], [CannotLoginUntilDateUtc], [Active], [Deleted], [IsSystemAccount], [SystemName], [LastIpAddress], [CreatedOnUtc], [LastLoginDateUtc], [LastActivityDateUtc], [RegisteredInStoreId], [BillingAddress_Id], [ShippingAddress_Id]) VALUES (N'a8fce858-7e76-4169-aa48-3e39f0d9412f', NULL, N'builtin@search_engine_record.com', NULL, N'Built-in system guest record used for requests from search engines.', 0, 0, 0, 0, 0, 0, NULL, 1, 0, 1, N'SearchEngine', NULL, CAST(N'2019-05-27T15:28:27.9219565' AS DateTime2), NULL, CAST(N'2019-05-27T15:28:27.9219565' AS DateTime2), 1, NULL, NULL)
INSERT [Customer] ([CustomerGuid], [Username], [Email], [EmailToRevalidate], [AdminComment], [IsTaxExempt], [AffiliateId], [VendorId], [HasShoppingCartItems], [RequireReLogin], [FailedLoginAttempts], [CannotLoginUntilDateUtc], [Active], [Deleted], [IsSystemAccount], [SystemName], [LastIpAddress], [CreatedOnUtc], [LastLoginDateUtc], [LastActivityDateUtc], [RegisteredInStoreId], [BillingAddress_Id], [ShippingAddress_Id]) VALUES (N'b72cba5f-86cf-483b-8987-74c0f2f05495', NULL, N'[email protected]', NULL, N'Built-in system record used for background tasks.', 0, 0, 0, 0, 0, 0, NULL, 1, 0, 1, N'BackgroundTask', NULL, CAST(N'2019-05-27T15:28:27.9386273' AS DateTime2), NULL, CAST(N'2019-05-27T15:28:27.9386273' AS DateTime2), 1, NULL, NULL)
INSERT [Customer] ([CustomerGuid], [Username], [Email], [EmailToRevalidate], [AdminComment], [IsTaxExempt], [AffiliateId], [VendorId], [HasShoppingCartItems], [RequireReLogin], [FailedLoginAttempts], [CannotLoginUntilDateUtc], [Active], [Deleted], [IsSystemAccount], [SystemName], [LastIpAddress], [CreatedOnUtc], [LastLoginDateUtc], [LastActivityDateUtc], [RegisteredInStoreId], [BillingAddress_Id], [ShippingAddress_Id]) VALUES (N'a8fce858-7e76-4169-aa48-3e39f0d9412f', NULL, N'builtin@search_engine_record.com', NULL, N'Built-in system guest record used for requests from search engines.', 0, 0, 0, 0, 0, 0, NULL, 1, 0, 1, N'SearchEngine', NULL, CAST(N'2019-05-27T15:28:27.9219565' AS DateTime2), NULL, CAST(N'2019-05-27T15:28:27.9219565' AS DateTime2), 1, NULL, NULL)
INSERT [Customer] ([CustomerGuid], [Username], [Email], [EmailToRevalidate], [AdminComment], [IsTaxExempt], [AffiliateId], [VendorId], [HasShoppingCartItems], [RequireReLogin], [FailedLoginAttempts], [CannotLoginUntilDateUtc], [Active], [Deleted], [IsSystemAccount], [SystemName], [LastIpAddress], [CreatedOnUtc], [LastLoginDateUtc], [LastActivityDateUtc], [RegisteredInStoreId], [BillingAddress_Id], [ShippingAddress_Id]) VALUES (N'b72cba5f-86cf-483b-8987-74c0f2f05495', NULL, N'[email protected]', NULL, N'Built-in system record used for background tasks.', 0, 0, 0, 0, 0, 0, NULL, 1, 0, 1, N'BackgroundTask', NULL, CAST(N'2019-05-27T15:28:27.9386273' AS DateTime2), NULL, CAST(N'2019-05-27T15:28:27.9386273' AS DateTime2), 1, NULL, NULL)