diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt
index bc25c88c877..ebd04a9ca2b 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt
@@ -618,6 +618,7 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
     private fun ConeKotlinType.asString(): String {
         return when (this) {
             is ConeKotlinErrorType -> "error: $reason"
+            is ConeClassErrorType -> "class error: $reason"
             is ConeClassLikeType -> {
                 val sb = StringBuilder()
                 sb.append(symbol.classId.asString())