diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/MangleConstant.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/MangleConstant.kt
index 03152fb8918..9c5de29d8f1 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/MangleConstant.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/MangleConstant.kt
@@ -19,6 +19,8 @@ enum class MangleConstant(val prefix: Char, val separator: Char, val suffix: Cha
         const val EXPECT_MARK = "#expect"
         const val UNKNOWN_MARK = "<unknown>"
         const val DYNAMIC_MARK = "<dynamic>"
+        const val ERROR_MARK = "<ERROR CLASS>"
+        const val ERROR_DECLARATION = "<ERROR DECLARATION>"
         const val STATIC_MEMBER_MARK = "#static"
 
         const val VARIANCE_SEPARATOR = '|'
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/ir/IrExportCheckerVisitor.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/ir/IrExportCheckerVisitor.kt
index a5131cccc6c..7198da340c4 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/ir/IrExportCheckerVisitor.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/ir/IrExportCheckerVisitor.kt
@@ -45,6 +45,7 @@ abstract class IrExportCheckerVisitor : IrElementVisitor<Boolean, Nothing?>, Kot
     override fun visitValueParameter(declaration: IrValueParameter, data: Nothing?) = false
     override fun visitVariable(declaration: IrVariable, data: Nothing?) = false
     override fun visitLocalDelegatedProperty(declaration: IrLocalDelegatedProperty, data: Nothing?) = false
+    override fun visitErrorDeclaration(declaration: IrErrorDeclaration, data: Nothing?): Boolean = false
 
     override fun visitTypeParameter(declaration: IrTypeParameter, data: Nothing?) = false
 
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/ir/IrMangleComputer.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/ir/IrMangleComputer.kt
index eaf68a0ae90..94dfc3aed27 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/ir/IrMangleComputer.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/ir/IrMangleComputer.kt
@@ -177,6 +177,7 @@ abstract class IrMangleComputer(protected val builder: StringBuilder, private va
                 if (type.hasQuestionMark) tBuilder.appendSignature(MangleConstant.Q_MARK)
             }
             is IrDynamicType -> tBuilder.appendSignature(MangleConstant.DYNAMIC_MARK)
+            is IrErrorType -> tBuilder.appendSignature(MangleConstant.ERROR_MARK)
             else -> error("Unexpected type $type")
         }
     }
@@ -187,6 +188,10 @@ abstract class IrMangleComputer(protected val builder: StringBuilder, private va
         declaration.parent.accept(this, data)
     }
 
+    override fun visitErrorDeclaration(declaration: IrErrorDeclaration, data: Boolean) {
+        declaration.mangleSimpleDeclaration(MangleConstant.ERROR_DECLARATION)
+    }
+
     override fun visitClass(declaration: IrClass, data: Boolean) {
         isRealExpect = isRealExpect or declaration.isExpect
         typeParameterContainer.add(declaration)