diff --git a/plugins/kotlinx-serialization/kotlinx-serialization.backend/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/BaseIrGenerator.kt b/plugins/kotlinx-serialization/kotlinx-serialization.backend/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/BaseIrGenerator.kt
index 59334939952..45c8f839e49 100644
--- a/plugins/kotlinx-serialization/kotlinx-serialization.backend/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/BaseIrGenerator.kt
+++ b/plugins/kotlinx-serialization/kotlinx-serialization.backend/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/BaseIrGenerator.kt
@@ -398,9 +398,17 @@ abstract class BaseIrGenerator(private val currentClass: IrClass, final override
         val kSerializerType = kSerializerClass.typeWith(compilerContext.irBuiltIns.anyType)
         val arrayType = compilerContext.irBuiltIns.arrayClass.typeWith(kSerializerType)
 
-        return addValPropertyWithJvmFieldInitializer(arrayType, SerialEntityNames.CACHED_CHILD_SERIALIZERS_PROPERTY_NAME) {
+        val property = addValPropertyWithJvmFieldInitializer(arrayType, SerialEntityNames.CACHED_CHILD_SERIALIZERS_PROPERTY_NAME) {
             createArrayOfExpression(kSerializerType, cacheableSerializers.map { it ?: irNull() })
         }
+
+        if (declarations.removeIf { declaration -> declaration === property }) {
+            // adding the property very first because children can be used even in first constructor
+            declarations.add(0, property)
+        }
+
+
+        return property
     }
 
     /**
diff --git a/plugins/kotlinx-serialization/testData/boxIr/caching.kt b/plugins/kotlinx-serialization/testData/boxIr/caching.kt
index 04c0e469222..bac772946eb 100644
--- a/plugins/kotlinx-serialization/testData/boxIr/caching.kt
+++ b/plugins/kotlinx-serialization/testData/boxIr/caching.kt
@@ -32,6 +32,18 @@ sealed class SealedListGeneric {
     var holder = GenericHolder<GenericHolder<List<SealedListGeneric>>>()
 }
 
+@Serializable
+class AccessFromCompanion(@Contextual val category: Any) {
+    companion object {
+        init {
+            serializer().descriptor.getElementDescriptor(0).isNullable
+        }
+        var isNullable = serializer().descriptor.getElementDescriptor(0).isNullable
+        val isNullable2 = serializer<AccessFromCompanion>().descriptor.getElementDescriptor(0).isNullable
+    }
+}
+
+
 fun box(): String {
     // A correctly cached class must be initialized correctly in order to exclude cyclic nesting of caches
     Plain.serializer()
@@ -40,6 +52,7 @@ fun box(): String {
     Abstract.serializer()
     SealedGeneric.serializer()
     SealedListGeneric.serializer()
+    AccessFromCompanion("any")
 
     return "OK"
 }