diff --git a/compiler/fir/cones/src/org/jetbrains/kotlin/fir/renderer/ConeAttributeRenderer.kt b/compiler/fir/cones/src/org/jetbrains/kotlin/fir/renderer/ConeAttributeRenderer.kt
index 13202d1cf6c..d0191ab0537 100644
--- a/compiler/fir/cones/src/org/jetbrains/kotlin/fir/renderer/ConeAttributeRenderer.kt
+++ b/compiler/fir/cones/src/org/jetbrains/kotlin/fir/renderer/ConeAttributeRenderer.kt
@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.fir.renderer
 
 import org.jetbrains.kotlin.fir.types.ConeAttribute
+import org.jetbrains.kotlin.utils.addToStdlib.ifNotEmpty
 
 abstract class ConeAttributeRenderer {
     abstract fun render(attributes: Iterable<ConeAttribute<*>>): String
@@ -17,6 +18,6 @@ abstract class ConeAttributeRenderer {
 
     object ForReadability : ConeAttributeRenderer() {
         override fun render(attributes: Iterable<ConeAttribute<*>>): String =
-            attributes.joinToString(separator = " ", postfix = " ") { it.renderForReadability() }
+            attributes.mapNotNull { it.renderForReadability() }.ifNotEmpty { joinToString(separator = " ", postfix = " ") } ?: ""
     }
 }
diff --git a/compiler/fir/cones/src/org/jetbrains/kotlin/fir/types/ConeAttributes.kt b/compiler/fir/cones/src/org/jetbrains/kotlin/fir/types/ConeAttributes.kt
index 70a30597420..9855a3ac261 100644
--- a/compiler/fir/cones/src/org/jetbrains/kotlin/fir/types/ConeAttributes.kt
+++ b/compiler/fir/cones/src/org/jetbrains/kotlin/fir/types/ConeAttributes.kt
@@ -30,7 +30,7 @@ abstract class ConeAttribute<out T : ConeAttribute<T>> : AnnotationMarker {
     abstract fun isSubtypeOf(other: @UnsafeVariance T?): Boolean
 
     abstract override fun toString(): String
-    open fun renderForReadability(): String = toString()
+    open fun renderForReadability(): String? = null
 
     abstract val key: KClass<out T>