diff --git a/IRaCIS.Core.Application/Service/TrialSiteUser/TrialConfigService.cs b/IRaCIS.Core.Application/Service/TrialSiteUser/TrialConfigService.cs
index e05a6c237..0cfa7c110 100644
--- a/IRaCIS.Core.Application/Service/TrialSiteUser/TrialConfigService.cs
+++ b/IRaCIS.Core.Application/Service/TrialSiteUser/TrialConfigService.cs
@@ -146,7 +146,7 @@ namespace IRaCIS.Core.Application
             return new GetLinkVerificationCodeIsEffectiveOutDto()
             {
 
-                IsEffective = inDto.LinkVerificationCode == (trial.LinkVerificationCode.IsNotNullOrEmpty() ? trial.ResearchProgramNo : trial.LinkVerificationCode)
+                IsEffective = inDto.LinkVerificationCode == (trial.LinkVerificationCode.IsNullOrEmpty() ? trial.ResearchProgramNo : trial.LinkVerificationCode)
             };
         }