diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/inline/DeepCopyIrTreeWithDescriptors.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/inline/DeepCopyIrTreeWithDescriptors.kt
index f64a41c598d..e8234686160 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/inline/DeepCopyIrTreeWithDescriptors.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/inline/DeepCopyIrTreeWithDescriptors.kt
@@ -90,7 +90,7 @@ internal class DeepCopyIrTreeWithSymbolsForInliner(val context: Context,
             }
 
             override fun visitField(declaration: IrField) {
-                (declaration.descriptor as WrappedFieldDescriptor).bind(declaration)
+                (declaration.descriptor as? WrappedFieldDescriptor)?.bind(declaration)
                 declaration.acceptChildrenVoid(this)
             }
 
@@ -1085,4 +1085,4 @@ internal class DescriptorSubstitutorForExternalScope(
 
         return oldExpression.shallowCopy(oldExpression.origin, createFunctionSymbol(newDescriptor), oldExpression.superQualifierSymbol)
     }
-}
\ No newline at end of file
+}