diff --git a/compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/exceptionInRepeatedAnnotation.fir.txt b/compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/exceptionInRepeatedAnnotation.fir.txt
index 3f32c97a821..3683345fd9e 100644
--- a/compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/exceptionInRepeatedAnnotation.fir.txt
+++ b/compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/exceptionInRepeatedAnnotation.fir.txt
@@ -20,7 +20,7 @@ FILE: exceptionInRepeatedAnnotation.kt
     public final inline fun <reified E : R|Event|> R|EventHandler<E>|.withPriority(): R|EventListener<@R|kotlin/ParameterName|(name = String(e))  E>| {
         ^withPriority Q|EventListener|.R|/EventListener.Companion.invoke|<R|@R|kotlin/ParameterName|(name = String(e))  E|>(this@R|/withPriority|)
     }
-    public final inline fun <reified E : R|Event|> R|EventHandler<E>|.withDefaultPriority(): R|EventListener<@R|kotlin/ParameterName|(name = String(e))  @R|kotlin/ParameterName|(name = String(e))  E>| {
+    public final inline fun <reified E : R|Event|> R|EventHandler<E>|.withDefaultPriority(): R|EventListener<@R|kotlin/ParameterName|(name = String(e))  E>| {
         ^withDefaultPriority this@R|/withDefaultPriority|.R|/withPriority|<R|@R|kotlin/ParameterName|(name = String(e))  E|>()
     }
     public abstract class Event : R|kotlin/Any| {
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/CustomAnnotationTypeAttribute.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/CustomAnnotationTypeAttribute.kt
index f02c2ef2226..36f79c85097 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/CustomAnnotationTypeAttribute.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/CustomAnnotationTypeAttribute.kt
@@ -15,7 +15,7 @@ class CustomAnnotationTypeAttribute(val annotations: List<FirAnnotation>) : Cone
     override fun intersect(other: CustomAnnotationTypeAttribute?): CustomAnnotationTypeAttribute? = null
 
     override fun add(other: CustomAnnotationTypeAttribute?): CustomAnnotationTypeAttribute {
-        if (other == null) return this
+        if (other == null || other === this) return this
         return CustomAnnotationTypeAttribute(annotations + other.annotations)
     }