diff --git a/compiler/fir/cones/src/org/jetbrains/kotlin/fir/renderer/ConeTypeRenderer.kt b/compiler/fir/cones/src/org/jetbrains/kotlin/fir/renderer/ConeTypeRenderer.kt
index 4cb50199e92..46b3fa8a7d7 100644
--- a/compiler/fir/cones/src/org/jetbrains/kotlin/fir/renderer/ConeTypeRenderer.kt
+++ b/compiler/fir/cones/src/org/jetbrains/kotlin/fir/renderer/ConeTypeRenderer.kt
@@ -37,7 +37,7 @@ open class ConeTypeRenderer(
         }
         val typeArguments = type.typeArguments
         val isExtension = type.isExtensionFunctionType
-        val (receiver, otherTypeArguments) = if (isExtension && typeArguments.first() != ConeStarProjection) {
+        val (receiver, otherTypeArguments) = if (isExtension && typeArguments.size >= 2 && typeArguments.first() != ConeStarProjection) {
             typeArguments.first() to typeArguments.drop(1)
         } else {
             null to typeArguments.toList()