diff --git a/ktor-ws-events-server/src/jvmMain/kotlin/dev/d1s/ktor/events/server/util/InternalComponents.kt b/ktor-ws-events-server/src/jvmMain/kotlin/dev/d1s/ktor/events/server/util/InternalComponents.kt
index d048c21..ff401b0 100644
--- a/ktor-ws-events-server/src/jvmMain/kotlin/dev/d1s/ktor/events/server/util/InternalComponents.kt
+++ b/ktor-ws-events-server/src/jvmMain/kotlin/dev/d1s/ktor/events/server/util/InternalComponents.kt
@@ -31,7 +31,7 @@ internal var Attributes.eventPool: EventPool
     set(value) = this.put(Key.EventPool, value)
 
 internal var Attributes.filter: OutgoingEventFilter?
-    get() = this[Key.Filter]
+    get() = this.getOrNull(Key.Filter)
     set(value) {
         value?.let {
             this.put(Key.Filter, it)