Server error is displayed on Clone Company form when try to Clone existing company.

Server error is displayed on Clone Company form when try to Clone existing company.
Replication Steps:
1. Login as Partner
2. Click on Employer Administration -> Clone Company
3. Provide valid data to Clone existing company.
4. Click on Save & Continue button.
Expected Result:
Server error should not be displayed on Clone Company form when try to clone existing company.
Actual Result:
Server error is displayed on Clone Company form when try to Clone existing company.

Error Log:
Exception : Object reference not set to an instance of an object.
App Error Log : -
Employee ID : 0
Action Name : SaveCloneCompany
Model : System.Web.Mvc.HandleErrorInfo
Controller : Configuration
Web Error Log : at WORKTERRA.SharedFunction.APICall(String url, String method, String contentType)
at WORKTERRA.SharedFunction.GetOneIAMAccessTokenForClientCredentialFlow()
at WORKTERRA.SharedFunction.CheckSanctionedCompanies(SanctionAPICompanyDTO objSanctionAPIUserDetails, String accessPath, Hashtable& objsaveToDB)
at WORKTERRA.CommonClasses.SanctionAPIHelper.CheckCompanyFromSanctionAPI(Hashtable companyDetails, String accessPath, Boolean isCallFromCloneCompany)
at WORKTERRA.Shared.Areas.Configuration.Models.CloneCompanyModel.SaveCloneCompany()
at WORKTERRA.Shared.Areas.Configuration.Controllers.ConfigurationController.SaveCloneCompany(List`1 lstCompanyList)
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.<>c_DisplayClass15.<InvokeActionMethodWithFilters>b_12()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)

CC: Saurabh SablakaSachin HingoleHrishikesh DeshpandeSamirRakesh Roy