diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IncrementalCompilationSupport.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IncrementalCompilationSupport.kt
index e534713c68f..468529b54e4 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IncrementalCompilationSupport.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IncrementalCompilationSupport.kt
@@ -114,7 +114,7 @@ class CurrentModuleWithICDeserializer(
         return this !is DeserializedDescriptor
     }
 
-    override fun init() {
+    override fun init(delegate: IrModuleDeserializer) {
         val knownBuiltIns = irBuiltIns.knownBuiltins.map { (it as IrSymbolOwner).symbol }.toSet()
         symbolTable.forEachPublicSymbol {
             if (it.descriptor.isDirtyDescriptor()) { // public && non-deserialized should be dirty symbol
@@ -124,7 +124,7 @@ class CurrentModuleWithICDeserializer(
             }
         }
 
-        icDeserializer.init(this)
+        icDeserializer.init(delegate)
     }
 
     override val klib: IrLibrary
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrModuleDeserializer.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrModuleDeserializer.kt
index a59966f4acd..93fdb37311c 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrModuleDeserializer.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrModuleDeserializer.kt
@@ -207,7 +207,7 @@ open class CurrentModuleDeserializer(
     override fun contains(idSig: IdSignature): Boolean = false // TODO:
 
     override fun deserializeIrSymbol(idSig: IdSignature, symbolKind: BinarySymbolData.SymbolKind): IrSymbol {
-        error("Unreachable execution: there could not be back-links")
+        error("Unreachable execution: there could not be back-links (sig: $idSig)")
     }
 
     override fun declareIrSymbol(symbol: IrSymbol) {}