New Site - Service Call ( Add serial Number )- Object reference not set to an instance of an object

Hello everybody,

I would need your help please.
So, we set up a new site in epicor, in this site, in the service call center, when i enter the serial number on the line without a pack number i have an error : Object reference not set to an instance of an object, but if I enter a pack number then I don’t have this error. Note that in other old sites we have, this error is not displayed.
Is there a configuration missing in the new site ?

The error display this message :

Exception caught in: Epicor.ServiceModel

Error Detail

Correlation ID: 0ace9632-a403-4b32-b680-f6c200430c5e
Message: Object reference not set to an instance of an object.
Program: Epicor.ServiceModel.dll
Method: ShouldRethrowNonRetryableException

Client Stack Trace

at Epicor.ServiceModel.Channels.ImplBase`1.ShouldRethrowNonRetryableException(Exception ex, DataSet[] dataSets)
at Erp.Proxy.BO.ServiceCallCenterImpl.ChangeDtlSerialNum(String ipPartNum, String ipSerialNum, String& opMessage, ServiceCallCenterDataSet ds)
at Erp.Adapters.ServiceCallCenterAdapter.ChangeDtlSerialNum(String ipPartNum, String ipSerialNum, String& opMessage, ServiceCallCenterDataSet ds)
at Erp.UI.App.ServiceCallCenterEntry.Transaction.onSSNChange(String serialNumber)
at Erp.UI.App.ServiceCallCenterEntry.Transaction.Table_ColumnChanging(Object sender, DataColumnChangeEventArgs e)
at System.Data.DataTable.OnColumnChanging(DataColumnChangeEventArgs e)
at Erp.BO.ServiceCallCenterDataSet.FSCallDtDataTable.OnColumnChanging(DataColumnChangeEventArgs e)
at System.Data.DataRow.set_Item(DataColumn column, Object value)
at System.Data.DataRowView.SetColumnValue(DataColumn column, Object value)
at System.Data.DataRowView.set_Item(String property, Object value)
at Ice.Lib.Framework.EpiTextBox.TextValidate(Object sender, CancelEventArgs ea)