diff --git a/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeInfo.kt b/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeInfo.kt
index f3e7d616e90..1cf39f7d2ff 100644
--- a/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeInfo.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeInfo.kt
@@ -307,14 +307,18 @@ public open class KotlinChangeInfo(
         val receiverTypeText = receiverParameterInfo?.currentTypeInfo?.render() ?: return null
         val typeSubstitutor = inheritedCallable.typeSubstitutor ?: return receiverTypeText
         val currentBaseFunction = inheritedCallable.baseFunction.currentCallableDescriptor ?: return receiverTypeText
-        return currentBaseFunction.extensionReceiverParameter!!.type.renderTypeWithSubstitution(typeSubstitutor, receiverTypeText, false)
+        val receiverType = currentBaseFunction.extensionReceiverParameter!!.type
+        if (receiverType.isError) return receiverTypeText
+        return receiverType.renderTypeWithSubstitution(typeSubstitutor, receiverTypeText, false)
     }
 
     public fun renderReturnType(inheritedCallable: KotlinCallableDefinitionUsage<*>): String {
         val defaultRendering = newReturnTypeInfo.render()
         val typeSubstitutor = inheritedCallable.typeSubstitutor ?: return defaultRendering
         val currentBaseFunction = inheritedCallable.baseFunction.currentCallableDescriptor ?: return defaultRendering
-        return currentBaseFunction.returnType!!.renderTypeWithSubstitution(typeSubstitutor, defaultRendering, false)
+        val returnType = currentBaseFunction.returnType!!
+        if (returnType.isError) return defaultRendering
+        return returnType.renderTypeWithSubstitution(typeSubstitutor, defaultRendering, false)
     }
 
     public fun primaryMethodUpdated() {
diff --git a/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinParameterInfo.kt b/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinParameterInfo.kt
index afd9208f7ba..d2160f34357 100644
--- a/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinParameterInfo.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinParameterInfo.kt
@@ -150,6 +150,7 @@ public class KotlinParameterInfo @JvmOverloads constructor (
         val typeSubstitutor = inheritedCallable.typeSubstitutor ?: return defaultRendering
         val currentBaseFunction = inheritedCallable.baseFunction.currentCallableDescriptor ?: return defaultRendering
         val parameterType = currentBaseFunction.getValueParameters().get(parameterIndex).getType()
+        if (parameterType.isError) return defaultRendering
         return parameterType.renderTypeWithSubstitution(typeSubstitutor, defaultRendering, true)
     }
 
diff --git a/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/usages/KotlinCallableDefinitionUsage.kt b/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/usages/KotlinCallableDefinitionUsage.kt
index faf384c9788..9722af761e5 100644
--- a/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/usages/KotlinCallableDefinitionUsage.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/usages/KotlinCallableDefinitionUsage.kt
@@ -120,12 +120,10 @@ class KotlinCallableDefinitionUsage<T : PsiElement>(
             processParameterListWithStructuralChanges(changeInfo, element, parameterList, psiFactory)
         }
         else if (parameterList != null) {
-            var paramIndex = if (originalCallableDescriptor.extensionReceiverParameter != null) 1 else 0
-
-            for (parameter in parameterList.parameters) {
-                val parameterInfo = changeInfo.newParameters[paramIndex]
+            val offset = if (originalCallableDescriptor.extensionReceiverParameter != null) 1 else 0
+            for ((paramIndex, parameter) in parameterList.parameters.withIndex()) {
+                val parameterInfo = changeInfo.newParameters[paramIndex + offset]
                 changeParameter(paramIndex, parameter, parameterInfo)
-                paramIndex++
             }
 
             parameterList.addToShorteningWaitSet(Options.DEFAULT)
diff --git a/idea/testData/refactoring/changeSignature/SetErrorParameterTypeAfter.kt b/idea/testData/refactoring/changeSignature/SetErrorParameterTypeAfter.kt
new file mode 100644
index 00000000000..b990b6c59a3
--- /dev/null
+++ b/idea/testData/refactoring/changeSignature/SetErrorParameterTypeAfter.kt
@@ -0,0 +1,11 @@
+open class A {
+    open fun Int.foo(n: XYZ): Int {
+        return 1
+    }
+}
+
+class B : A() {
+    override fun Int.foo(n: XYZ): Int {
+        return 2
+    }
+}
\ No newline at end of file
diff --git a/idea/testData/refactoring/changeSignature/SetErrorParameterTypeBefore.kt b/idea/testData/refactoring/changeSignature/SetErrorParameterTypeBefore.kt
new file mode 100644
index 00000000000..3b34acfcd4e
--- /dev/null
+++ b/idea/testData/refactoring/changeSignature/SetErrorParameterTypeBefore.kt
@@ -0,0 +1,11 @@
+open class A {
+    open fun Int.<caret>foo(n: Int): Int {
+        return 1
+    }
+}
+
+class B : A() {
+    override fun Int.foo(n: Int): Int {
+        return 2
+    }
+}
\ No newline at end of file
diff --git a/idea/testData/refactoring/changeSignature/SetErrorReceiverTypeAfter.kt b/idea/testData/refactoring/changeSignature/SetErrorReceiverTypeAfter.kt
new file mode 100644
index 00000000000..a9779abc3df
--- /dev/null
+++ b/idea/testData/refactoring/changeSignature/SetErrorReceiverTypeAfter.kt
@@ -0,0 +1,11 @@
+open class A {
+    open fun XYZ.foo(n: Int): Int {
+        return 1
+    }
+}
+
+class B : A() {
+    override fun XYZ.foo(n: Int): Int {
+        return 2
+    }
+}
\ No newline at end of file
diff --git a/idea/testData/refactoring/changeSignature/SetErrorReceiverTypeBefore.kt b/idea/testData/refactoring/changeSignature/SetErrorReceiverTypeBefore.kt
new file mode 100644
index 00000000000..3b34acfcd4e
--- /dev/null
+++ b/idea/testData/refactoring/changeSignature/SetErrorReceiverTypeBefore.kt
@@ -0,0 +1,11 @@
+open class A {
+    open fun Int.<caret>foo(n: Int): Int {
+        return 1
+    }
+}
+
+class B : A() {
+    override fun Int.foo(n: Int): Int {
+        return 2
+    }
+}
\ No newline at end of file
diff --git a/idea/testData/refactoring/changeSignature/SetErrorReturnTypeAfter.kt b/idea/testData/refactoring/changeSignature/SetErrorReturnTypeAfter.kt
new file mode 100644
index 00000000000..b4af701be62
--- /dev/null
+++ b/idea/testData/refactoring/changeSignature/SetErrorReturnTypeAfter.kt
@@ -0,0 +1,11 @@
+open class A {
+    open fun Int.foo(n: Int): XYZ {
+        return 1
+    }
+}
+
+class B : A() {
+    override fun Int.foo(n: Int): XYZ {
+        return 2
+    }
+}
\ No newline at end of file
diff --git a/idea/testData/refactoring/changeSignature/SetErrorReturnTypeBefore.kt b/idea/testData/refactoring/changeSignature/SetErrorReturnTypeBefore.kt
new file mode 100644
index 00000000000..3b34acfcd4e
--- /dev/null
+++ b/idea/testData/refactoring/changeSignature/SetErrorReturnTypeBefore.kt
@@ -0,0 +1,11 @@
+open class A {
+    open fun Int.<caret>foo(n: Int): Int {
+        return 1
+    }
+}
+
+class B : A() {
+    override fun Int.foo(n: Int): Int {
+        return 2
+    }
+}
\ No newline at end of file
diff --git a/idea/tests/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeSignatureTest.kt b/idea/tests/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeSignatureTest.kt
index c74c0adee04..6a9ab788f94 100644
--- a/idea/tests/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeSignatureTest.kt
+++ b/idea/tests/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeSignatureTest.kt
@@ -897,4 +897,10 @@ class KotlinChangeSignatureTest : KotlinCodeInsightTestCase() {
     fun testRemoveParameterKeepFormat3() = doTest { removeParameter(2) }
 
     fun testSwapParametersKeepFormat() = doTest { swapParameters(0, 2) }
+
+    fun testSetErrorReturnType() = doTest { newReturnTypeInfo = KotlinTypeInfo(true, null, "XYZ") }
+
+    fun testSetErrorReceiverType() = doTest { receiverParameterInfo!!.currentTypeInfo = KotlinTypeInfo(true, null, "XYZ") }
+
+    fun testSetErrorParameterType() = doTest { newParameters[1].currentTypeInfo = KotlinTypeInfo(true, null, "XYZ") }
 }
\ No newline at end of file