diff --git a/Source/StudyFrameworkPlugin/Private/SFGameInstance.cpp b/Source/StudyFrameworkPlugin/Private/SFGameInstance.cpp
index cd15145a398f025fdb35145b156a8e327df53314..dd5dc3cbe413139ca5fafce5b1fc578267ace5c5 100644
--- a/Source/StudyFrameworkPlugin/Private/SFGameInstance.cpp
+++ b/Source/StudyFrameworkPlugin/Private/SFGameInstance.cpp
@@ -302,6 +302,10 @@ void USFGameInstance::PrepareWithStudySetup(ASFStudySetup* Setup)
 				{
 					FSFUtils::OpenMessageBox("Participant ID \"" + IDGiven + "\"was already used, you have to choose another one!");
 				}
+				else if (IDGiven.IsEmpty())
+				{
+					FSFUtils::OpenMessageBox("Participant ID given is empty, you have to choose one!");
+				}
 				else
 				{
 					ParticipantID = IDGiven;