diff --git a/src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinNamesAnnotationIntrospector.kt b/src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinNamesAnnotationIntrospector.kt
index 98b93908..2d84053e 100644
--- a/src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinNamesAnnotationIntrospector.kt
+++ b/src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinNamesAnnotationIntrospector.kt
@@ -10,7 +10,9 @@ import com.fasterxml.jackson.databind.introspect.AnnotatedMember
 import com.fasterxml.jackson.databind.introspect.AnnotatedMethod
 import com.fasterxml.jackson.databind.introspect.AnnotatedParameter
 import com.fasterxml.jackson.databind.introspect.NopAnnotationIntrospector
-import com.fasterxml.jackson.module.kotlin.deser.StrictNullChecksConverter
+import com.fasterxml.jackson.databind.util.Converter
+import com.fasterxml.jackson.module.kotlin.deser.CollectionValueStrictNullChecksConverter
+import com.fasterxml.jackson.module.kotlin.deser.MapValueStrictNullChecksConverter
 import com.fasterxml.jackson.module.kotlin.deser.ValueClassUnboxConverter
 import com.fasterxml.jackson.module.kotlin.deser.value_instantiator.creator.ValueParameter
 import kotlinx.metadata.Flag
@@ -138,15 +140,15 @@ private fun ValueParameter.createValueClassUnboxConverterOrNull(rawType: Class<*
 // @see com.fasterxml.jackson.module.kotlin._ported.test.StrictNullChecksTest#testListOfGenericWithNullValue
 private fun ValueParameter.isNullishTypeAt(index: Int) = arguments.getOrNull(index)?.isNullable ?: true
 
-private fun ValueParameter.createStrictNullChecksConverterOrNull(rawType: Class<*>): StrictNullChecksConverter<*>? {
+private fun ValueParameter.createStrictNullChecksConverterOrNull(rawType: Class<*>): Converter<*, *>? {
     @Suppress("UNCHECKED_CAST")
     return when {
         Array::class.java.isAssignableFrom(rawType) && !this.isNullishTypeAt(0) ->
-            StrictNullChecksConverter.ForArray(rawType as Class<Array<*>>, this)
+            CollectionValueStrictNullChecksConverter.ForArray(this)
         Iterable::class.java.isAssignableFrom(rawType) && !this.isNullishTypeAt(0) ->
-            StrictNullChecksConverter.ForIterable(rawType as Class<Iterable<*>>, this)
+            CollectionValueStrictNullChecksConverter.ForIterable(this)
         Map::class.java.isAssignableFrom(rawType) && !this.isNullishTypeAt(1) ->
-            StrictNullChecksConverter.ForMapValue(rawType as Class<Map<*, *>>, this)
+            MapValueStrictNullChecksConverter(this)
         else -> null
     }
 }
diff --git a/src/main/kotlin/com/fasterxml/jackson/module/kotlin/deser/Converters.kt b/src/main/kotlin/com/fasterxml/jackson/module/kotlin/deser/Converters.kt
index 6926974a..0b38c8d3 100644
--- a/src/main/kotlin/com/fasterxml/jackson/module/kotlin/deser/Converters.kt
+++ b/src/main/kotlin/com/fasterxml/jackson/module/kotlin/deser/Converters.kt
@@ -2,24 +2,21 @@ package com.fasterxml.jackson.module.kotlin.deser
 
 import com.fasterxml.jackson.databind.JavaType
 import com.fasterxml.jackson.databind.type.TypeFactory
-import com.fasterxml.jackson.databind.util.Converter
+import com.fasterxml.jackson.databind.util.StdConverter
 import com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException
 import com.fasterxml.jackson.module.kotlin.deser.value_instantiator.creator.ValueParameter
 
-internal class ValueClassUnboxConverter<T : Any>(private val valueClass: Class<T>) : Converter<T, Any?> {
+internal class ValueClassUnboxConverter<T : Any>(private val valueClass: Class<T>) : StdConverter<T, Any?>() {
     private val unboxMethod = valueClass.getDeclaredMethod("unbox-impl").apply {
         if (!this.isAccessible) this.isAccessible = true
     }
-    private val outType = unboxMethod.returnType
 
     override fun convert(value: T): Any? = unboxMethod.invoke(value)
 
     override fun getInputType(typeFactory: TypeFactory): JavaType = typeFactory.constructType(valueClass)
-    override fun getOutputType(typeFactory: TypeFactory): JavaType = typeFactory.constructType(outType)
 }
 
-internal sealed class StrictNullChecksConverter<T : Any> : Converter<T, T> {
-    protected abstract val clazz: Class<T>
+internal sealed class CollectionValueStrictNullChecksConverter<T : Any> : StdConverter<T, T>() {
     protected abstract val valueParameter: ValueParameter
 
     protected abstract fun getValues(value: T): Iterator<*>
@@ -38,27 +35,31 @@ internal sealed class StrictNullChecksConverter<T : Any> : Converter<T, T> {
         return value
     }
 
-    override fun getInputType(typeFactory: TypeFactory): JavaType = typeFactory.constructType(clazz)
-    override fun getOutputType(typeFactory: TypeFactory): JavaType = typeFactory.constructType(clazz)
-
     class ForIterable(
-        override val clazz: Class<Iterable<*>>,
         override val valueParameter: ValueParameter
-    ) : StrictNullChecksConverter<Iterable<*>>() {
+    ) : CollectionValueStrictNullChecksConverter<Iterable<*>>() {
         override fun getValues(value: Iterable<*>): Iterator<*> = value.iterator()
     }
 
     class ForArray(
-        override val clazz: Class<Array<*>>,
         override val valueParameter: ValueParameter
-    ) : StrictNullChecksConverter<Array<*>>() {
+    ) : CollectionValueStrictNullChecksConverter<Array<*>>() {
         override fun getValues(value: Array<*>): Iterator<*> = value.iterator()
     }
+}
 
-    class ForMapValue(
-        override val clazz: Class<Map<*, *>>,
-        override val valueParameter: ValueParameter
-    ) : StrictNullChecksConverter<Map<*, *>>() {
-        override fun getValues(value: Map<*, *>): Iterator<*> = value.values.iterator()
+internal class MapValueStrictNullChecksConverter(
+    private val valueParameter: ValueParameter
+) : StdConverter<Map<*, *>, Map<*, *>>() {
+    override fun convert(value: Map<*, *>): Map<*, *> = value.apply {
+        entries.forEach { (k, v) ->
+            if (v == null) {
+                throw MissingKotlinParameterException(
+                    valueParameter,
+                    null,
+                    "A null value was entered for key $k of the parameter ${valueParameter.name}."
+                )
+            }
+        }
     }
 }