diff --git a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/AbstractListCommonizer.kt b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/AbstractListCommonizer.kt
index 9b00be5be08..6d6a4dc926c 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/AbstractListCommonizer.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/AbstractListCommonizer.kt
@@ -15,14 +15,14 @@ import org.jetbrains.kotlin.commonizer.cir.CirType
  *   Input: N lists of [CirType]
  *   Output: list of [CirType]
  */
-abstract class AbstractListCommonizer<T, R: Any>(
+abstract class AbstractListCommonizer<T, R : Any>(
     private val singleElementCommonizerFactory: (Int) -> Commonizer<T, R?>
-) : Commonizer<List<T>, List<R>> {
+) : Commonizer<List<T>, List<R>?> {
     private var commonizers: Array<Commonizer<T, R?>>? = null
     private var error = false
 
-    final override val result: List<R>
-        get() = checkState(commonizers, error).mapNotNull { it.result }
+    final override val result: List<R>?
+        get() = checkState(commonizers, error).map { it.result ?: return null }
 
     final override fun commonizeWith(next: List<T>): Boolean {
         if (error)
diff --git a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/CallableValueParametersCommonizer.kt b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/CallableValueParametersCommonizer.kt
index da9a4280e93..e3227d74e73 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/CallableValueParametersCommonizer.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/CallableValueParametersCommonizer.kt
@@ -17,7 +17,7 @@ import org.jetbrains.kotlin.commonizer.utils.isObjCInteropCallableAnnotation
 
 class CallableValueParametersCommonizer(
     typeCommonizer: TypeCommonizer,
-) : Commonizer<CirCallableMemberWithParameters, CallableValueParametersCommonizer.Result> {
+) : Commonizer<CirCallableMemberWithParameters, CallableValueParametersCommonizer.Result?> {
     class Result(
         val hasStableParameterNames: Boolean,
         val valueParameters: List<CirValueParameter>,
@@ -121,7 +121,7 @@ class CallableValueParametersCommonizer(
     private var valueParameterNames: ValueParameterNames? = null
     private var error = false
 
-    override val result: Result
+    override val result: Result?
         get() {
             // don't inline `patchCallables` property;
             // valueParameters.overwriteNames() should be called strongly before valueParameters.result
@@ -141,7 +141,7 @@ class CallableValueParametersCommonizer(
 
             return Result(
                 hasStableParameterNames = hasStableParameterNames,
-                valueParameters = valueParameters.result,
+                valueParameters = valueParameters.result ?: return null,
                 patchCallables = patchCallables
             )
         }
diff --git a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ClassCommonizer.kt b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ClassCommonizer.kt
index 72110a84b11..706f25d2a9d 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ClassCommonizer.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ClassCommonizer.kt
@@ -12,7 +12,7 @@ import org.jetbrains.kotlin.descriptors.ClassKind
 class ClassCommonizer internal constructor(
     typeCommonizer: TypeCommonizer,
     supertypesCommonizer: ClassSuperTypeCommonizer
-) : AbstractStandardCommonizer<CirClass, CirClass>() {
+) : AbstractStandardCommonizer<CirClass, CirClass?>() {
     private lateinit var name: CirName
     private lateinit var kind: ClassKind
     private var isInner = false
@@ -23,21 +23,23 @@ class ClassCommonizer internal constructor(
     private val modalityCommonizer: ModalityCommonizer = ModalityCommonizer()
     private val visibilityCommonizer: VisibilityCommonizer = VisibilityCommonizer.equalizing()
 
-    override fun commonizationResult() = CirClass.create(
-        annotations = emptyList(),
-        name = name,
-        typeParameters = typeParameterListCommonizer.result,
-        supertypes = supertypesCommonizer.result,
-        visibility = visibilityCommonizer.result,
-        modality = modalityCommonizer.result,
-        kind = kind,
-        companion = null,
-        isCompanion = isCompanion,
-        isData = false,
-        isValue = isValue,
-        isInner = isInner,
-        isExternal = false
-    )
+    override fun commonizationResult(): CirClass? {
+        return CirClass.create(
+            annotations = emptyList(),
+            name = name,
+            typeParameters = typeParameterListCommonizer.result ?: return null,
+            supertypes = supertypesCommonizer.result,
+            visibility = visibilityCommonizer.result,
+            modality = modalityCommonizer.result,
+            kind = kind,
+            companion = null,
+            isCompanion = isCompanion,
+            isData = false,
+            isValue = isValue,
+            isInner = isInner,
+            isExternal = false
+        )
+    }
 
     override fun initialize(first: CirClass) {
         name = first.name
diff --git a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ClassConstructorCommonizer.kt b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ClassConstructorCommonizer.kt
index 468af68f8fd..5c98e6cd168 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ClassConstructorCommonizer.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ClassConstructorCommonizer.kt
@@ -12,20 +12,20 @@ import org.jetbrains.kotlin.descriptors.Modality
 
 class ClassConstructorCommonizer(
     typeCommonizer: TypeCommonizer,
-) : AbstractStandardCommonizer<CirClassConstructor, CirClassConstructor>() {
+) : AbstractStandardCommonizer<CirClassConstructor, CirClassConstructor?>() {
     private var isPrimary = false
     private val visibility = VisibilityCommonizer.equalizing()
     private val typeParameterListCommonizer = TypeParameterListCommonizer(typeCommonizer)
     private val valueParametersCommonizer = CallableValueParametersCommonizer(typeCommonizer)
     private val annotationsCommonizer: AnnotationsCommonizer = AnnotationsCommonizer()
 
-    override fun commonizationResult(): CirClassConstructor {
-        val valueParameters = valueParametersCommonizer.result
+    override fun commonizationResult(): CirClassConstructor? {
+        val valueParameters = valueParametersCommonizer.result ?: return null
         valueParameters.patchCallables()
 
         return CirClassConstructor.create(
             annotations = annotationsCommonizer.result,
-            typeParameters = typeParameterListCommonizer.result,
+            typeParameters = typeParameterListCommonizer.result ?: return null,
             visibility = visibility.result,
             containingClass = CONTAINING_CLASS_DOES_NOT_MATTER, // does not matter
             valueParameters = valueParameters.valueParameters,
diff --git a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/TypeParameterCommonizer.kt b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/TypeParameterCommonizer.kt
index a4245ed7aae..f79b51fa939 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/TypeParameterCommonizer.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/TypeParameterCommonizer.kt
@@ -10,19 +10,21 @@ import org.jetbrains.kotlin.commonizer.cir.CirType
 import org.jetbrains.kotlin.commonizer.cir.CirTypeParameter
 import org.jetbrains.kotlin.types.Variance
 
-class TypeParameterCommonizer(typeCommonizer: TypeCommonizer) : AbstractStandardCommonizer<CirTypeParameter, CirTypeParameter>() {
+class TypeParameterCommonizer(typeCommonizer: TypeCommonizer) : AbstractStandardCommonizer<CirTypeParameter, CirTypeParameter?>() {
     private lateinit var name: CirName
     private var isReified = false
     private lateinit var variance: Variance
     private val upperBounds = TypeParameterUpperBoundsCommonizer(typeCommonizer)
 
-    override fun commonizationResult() = CirTypeParameter(
-        annotations = emptyList(),
-        name = name,
-        isReified = isReified,
-        variance = variance,
-        upperBounds = upperBounds.result
-    )
+    override fun commonizationResult(): CirTypeParameter? {
+        return CirTypeParameter(
+            annotations = emptyList(),
+            name = name,
+            isReified = isReified,
+            variance = variance,
+            upperBounds = upperBounds.result ?: return null
+        )
+    }
 
     override fun initialize(first: CirTypeParameter) {
         name = first.name
diff --git a/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/TypeParameterCommonizerTest.kt b/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/TypeParameterCommonizerTest.kt
index 08a23fbec53..6243b072b27 100644
--- a/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/TypeParameterCommonizerTest.kt
+++ b/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/TypeParameterCommonizerTest.kt
@@ -12,7 +12,7 @@ import org.jetbrains.kotlin.commonizer.utils.mockClassType
 import org.jetbrains.kotlin.types.Variance
 import org.junit.Test
 
-class TypeParameterCommonizerTest : AbstractCommonizerTest<CirTypeParameter, CirTypeParameter>() {
+class TypeParameterCommonizerTest : AbstractCommonizerTest<CirTypeParameter, CirTypeParameter?>() {
     override fun createCommonizer() = TypeParameterCommonizer(TypeCommonizer(MOCK_CLASSIFIERS))
 
     @Test
diff --git a/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/TypeParameterListCommonizerTest.kt b/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/TypeParameterListCommonizerTest.kt
index 1818ebee761..8abd05a1c40 100644
--- a/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/TypeParameterListCommonizerTest.kt
+++ b/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/TypeParameterListCommonizerTest.kt
@@ -9,7 +9,7 @@ import org.jetbrains.kotlin.commonizer.cir.CirTypeParameter
 import org.jetbrains.kotlin.commonizer.utils.MOCK_CLASSIFIERS
 import org.junit.Test
 
-class TypeParameterListCommonizerTest : AbstractCommonizerTest<List<CirTypeParameter>, List<CirTypeParameter>>() {
+class TypeParameterListCommonizerTest : AbstractCommonizerTest<List<CirTypeParameter>, List<CirTypeParameter>?>() {
 
     @Test
     fun emptyValueParameters() = doTestSuccess(
diff --git a/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/ValueParameterListCommonizerTest.kt b/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/ValueParameterListCommonizerTest.kt
index e31986f233f..0d7b81407e6 100644
--- a/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/ValueParameterListCommonizerTest.kt
+++ b/native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/ValueParameterListCommonizerTest.kt
@@ -8,8 +8,9 @@ package org.jetbrains.kotlin.commonizer.core
 import org.jetbrains.kotlin.commonizer.cir.CirValueParameter
 import org.jetbrains.kotlin.commonizer.utils.MOCK_CLASSIFIERS
 import org.junit.Test
+import kotlin.test.assertEquals
 
-class ValueParameterListCommonizerTest : AbstractCommonizerTest<List<CirValueParameter>, List<CirValueParameter>>() {
+class ValueParameterListCommonizerTest : AbstractCommonizerTest<List<CirValueParameter>, List<CirValueParameter>?>() {
 
     @Test
     fun emptyValueParameters() = doTestSuccess(
@@ -130,24 +131,30 @@ class ValueParameterListCommonizerTest : AbstractCommonizerTest<List<CirValuePar
         )
     )
 
-    @Test(expected = IllegalCommonizerStateException::class)
-    fun mismatchedParameterTypes() = doTestFailure(
-        mockValueParams(
-            "a" to "kotlin/String",
-            "b" to "kotlin/Int",
-            "c" to "org/sample/Foo"
-        ),
-        mockValueParams(
-            "a" to "kotlin/String",
-            "b" to "kotlin/Int",
-            "c" to "org/sample/Foo"
-        ),
-        mockValueParams(
-            "a" to "kotlin/Int",
-            "b" to "kotlin/String",
-            "c" to "org/sample/Bar"
+    @Test
+    fun mismatchedParameterTypes() {
+        assertEquals(
+            null, createCommonizer().commonize(
+                listOf(
+                    mockValueParams(
+                        "a" to "kotlin/String",
+                        "b" to "kotlin/Int",
+                        "c" to "org/sample/Foo"
+                    ),
+                    mockValueParams(
+                        "a" to "kotlin/String",
+                        "b" to "kotlin/Int",
+                        "c" to "org/sample/Foo"
+                    ),
+                    mockValueParams(
+                        "a" to "kotlin/Int",
+                        "b" to "kotlin/String",
+                        "c" to "org/sample/Bar"
+                    )
+                )
+            )
         )
-    )
+    }
 
     override fun createCommonizer() = ValueParameterListCommonizer(TypeCommonizer(MOCK_CLASSIFIERS))