diff --git a/compiler/light-classes/src/org/jetbrains/kotlin/asJava/lightClassUtils.kt b/compiler/light-classes/src/org/jetbrains/kotlin/asJava/lightClassUtils.kt
index bcfe80f1709..1f74501bf57 100644
--- a/compiler/light-classes/src/org/jetbrains/kotlin/asJava/lightClassUtils.kt
+++ b/compiler/light-classes/src/org/jetbrains/kotlin/asJava/lightClassUtils.kt
@@ -85,6 +85,7 @@ fun KtParameter.toPsiParameters(): Collection<PsiParameter> {
     val paramList = getNonStrictParentOfType<KtParameterList>() ?: return emptyList()
 
     val paramIndex = paramList.parameters.indexOf(this)
+    if (paramIndex < 0) return emptyList()
     val owner = paramList.parent
     val lightParamIndex = if (owner is KtDeclaration && owner.isExtensionDeclaration()) paramIndex + 1 else paramIndex
 
@@ -95,9 +96,7 @@ fun KtParameter.toPsiParameters(): Collection<PsiParameter> {
                 else -> null
             } ?: return emptyList()
 
-    return methods.mapNotNull {
-        if (it.parameterList.parametersCount > lightParamIndex) it.parameterList.parameters[lightParamIndex] else null
-    }
+    return methods.mapNotNull { it.parameterList.parameters.getOrNull(lightParamIndex) }
 }
 
 private fun KtParameter.toAnnotationLightMethod(): PsiMethod? {