diff --git a/Code/Framework/AzCore/AzCore/Serialization/Json/RegistrationContext.cpp b/Code/Framework/AzCore/AzCore/Serialization/Json/RegistrationContext.cpp
index 9aa80a2ef2..82db4df000 100644
--- a/Code/Framework/AzCore/AzCore/Serialization/Json/RegistrationContext.cpp
+++ b/Code/Framework/AzCore/AzCore/Serialization/Json/RegistrationContext.cpp
@@ -51,7 +51,8 @@ namespace AZ
                 AZ_Assert(
                     emplaceResult.second,
                     "Couldn't register Json serializer %s. Another serializer (%s) has already been registered for the same Uuid (%s).",
-                    serializer->RTTI_GetTypeName(), emplaceResult.first->second->RTTI_GetTypeName(), uuid);
+                    serializer->RTTI_GetTypeName(), emplaceResult.first->second->RTTI_GetTypeName(),
+                    uuid.ToString<AZStd::string>().c_str());
             }
             else
             {
diff --git a/Code/Framework/AzCore/Tests/Serialization/Json/JsonRegistrationContextTests.cpp b/Code/Framework/AzCore/Tests/Serialization/Json/JsonRegistrationContextTests.cpp
index 6012a824c7..7367fd47ff 100644
--- a/Code/Framework/AzCore/Tests/Serialization/Json/JsonRegistrationContextTests.cpp
+++ b/Code/Framework/AzCore/Tests/Serialization/Json/JsonRegistrationContextTests.cpp
@@ -285,7 +285,7 @@ namespace JsonSerializationTests
 
         EXPECT_EQ(1, m_jsonRegistrationContext->GetRegisteredSerializers().size());
         AZ::BaseJsonSerializer* mockSerializer = m_jsonRegistrationContext->GetSerializerForType(azrtti_typeid<bool>());
-        EXPECT_NE(mockSerializer, nullptr);
+        ASSERT_NE(mockSerializer, nullptr);
         EXPECT_EQ(AZ::AzTypeInfo<SerializerWithOneType>::Uuid(), mockSerializer->RTTI_GetType());
 
         SerializerWithOneType::Unreflect(m_jsonRegistrationContext.get());
@@ -301,7 +301,7 @@ namespace JsonSerializationTests
         
         EXPECT_EQ(1, m_jsonRegistrationContext->GetRegisteredSerializers().size());
         AZ::BaseJsonSerializer* mockSerializer = m_jsonRegistrationContext->GetSerializerForType(azrtti_typeid<bool>());
-        EXPECT_NE(mockSerializer, nullptr);
+        ASSERT_NE(mockSerializer, nullptr);
         EXPECT_EQ(AZ::AzTypeInfo<SerializerWithOneDuplicatedTypeWithOverride>::Uuid(), mockSerializer->RTTI_GetType());
 
         SerializerWithOneType::Unreflect(m_jsonRegistrationContext.get());