diff --git a/ktor-server/ktor-server-core/jvm/src/io/ktor/sessions/SessionTrackerById.kt b/ktor-server/ktor-server-core/jvm/src/io/ktor/sessions/SessionTrackerById.kt
index f32d67ec75f..aa7b293dad6 100644
--- a/ktor-server/ktor-server-core/jvm/src/io/ktor/sessions/SessionTrackerById.kt
+++ b/ktor-server/ktor-server-core/jvm/src/io/ktor/sessions/SessionTrackerById.kt
@@ -85,8 +85,8 @@ public class SessionTrackerById<S : Any>(
             )
         }
 
-        // we remove the wrong session identifier if no related session found
-        call.attributes.put(sessionIdKey, sessionId)
+        // Remove the wrong session identifier if no related session was found
+        call.attributes.remove(sessionIdKey)
 
         return null
     }