diff --git a/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/changeSignatureUtils.kt b/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/changeSignatureUtils.kt
index c6ee7d6f7a5..8251b94a025 100644
--- a/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/changeSignatureUtils.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/changeSignatureUtils.kt
@@ -88,6 +88,7 @@ fun DeclarationDescriptor.createDeepCopy() = (this as? JavaMethodDescriptor)?.su
 private object ForceTypeCopySubstitution : TypeSubstitution() {
     override fun get(key: KotlinType) =
             with(key) {
+                if (isError) return@with asTypeProjection()
                 KotlinTypeImpl.create(
                         annotations, constructor, isMarkedNullable, arguments, memberScope, capabilities).asTypeProjection()
             }