diff --git a/src/test/kotlin/com/exactpro/th2/common/util/TestMultiMapDeserializer.kt b/src/test/kotlin/com/exactpro/th2/common/util/TestMultiMapDeserializer.kt
index e013fe46..c08a3d02 100644
--- a/src/test/kotlin/com/exactpro/th2/common/util/TestMultiMapDeserializer.kt
+++ b/src/test/kotlin/com/exactpro/th2/common/util/TestMultiMapDeserializer.kt
@@ -40,8 +40,8 @@ class TestMultiMapDeserializer {
                     .configure(KotlinFeature.NullToEmptyCollection, false)
                     .configure(KotlinFeature.NullToEmptyMap, false)
                     .configure(KotlinFeature.NullIsSameAsDefault, false)
-                    .configure(KotlinFeature.SingletonSupport, false)
-                    .configure(KotlinFeature.StrictNullChecks, true)
+                    .configure(KotlinFeature.SingletonSupport, true)
+                    .configure(KotlinFeature.StrictNullChecks, false)
                     .build()
             )