From f7429d969ca3e9bb616a7d79cc7a13b810117acb Mon Sep 17 00:00:00 2001
From: Mariia Skripchenko <61115099+marychatte@users.noreply.github.com>
Date: Fri, 8 Nov 2024 14:06:18 +0100
Subject: [PATCH] Fix api

---
 .../common/src/io/ktor/server/sse/Routing.kt             | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/ktor-server/ktor-server-plugins/ktor-server-sse/common/src/io/ktor/server/sse/Routing.kt b/ktor-server/ktor-server-plugins/ktor-server-sse/common/src/io/ktor/server/sse/Routing.kt
index b2b344bfc6..6b315737b8 100644
--- a/ktor-server/ktor-server-plugins/ktor-server-sse/common/src/io/ktor/server/sse/Routing.kt
+++ b/ktor-server/ktor-server-plugins/ktor-server-sse/common/src/io/ktor/server/sse/Routing.kt
@@ -146,15 +146,14 @@ private fun Route.processSSEWithoutSerialization(
 ) = processSSE(serialize, handler)
 
 private fun Route.processSSEWithSerialization(
-    serialize: ((TypeInfo, Any) -> String)?,
+    serialize: ((TypeInfo, Any) -> String),
     handler: suspend ServerSSESessionWithSerialization.() -> Unit
 ) {
     val sessionHandler: suspend ServerSSESession.() -> Unit = {
-        if (this is ServerSSESessionWithSerialization) {
-            handler()
-        } else {
-            throw IllegalStateException("ServerSSESessionWithSerialization is required.")
+        check(this is ServerSSESessionWithSerialization) {
+            "Impossible state. Please report this bug: https://youtrack.jetbrains.com/newIssue?project=KTOR"
         }
+        handler()
     }
     processSSE(serialize, sessionHandler)
 }