diff --git a/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/data/KnockRequestsException.kt b/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/data/KnockRequestsException.kt
new file mode 100644
index 0000000000..0880233ff6
--- /dev/null
+++ b/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/data/KnockRequestsException.kt
@@ -0,0 +1,13 @@
+/*
+ * Copyright 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Please see LICENSE in the repository root for full details.
+ */
+
+package io.element.android.features.knockrequests.impl.data
+
+sealed class KnockRequestsException : Exception() {
+    data object AcceptAllPartiallyFailed : KnockRequestsException()
+    data object KnockRequestNotFound : KnockRequestsException()
+}
diff --git a/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/data/KnockRequestsService.kt b/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/data/KnockRequestsService.kt
index d8a594f148..fb08821387 100644
--- a/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/data/KnockRequestsService.kt
+++ b/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/data/KnockRequestsService.kt
@@ -105,7 +105,7 @@ class KnockRequestsService(
         if (results.all { it.isSuccess }) {
             Result.success(Unit)
         } else {
-            Result.failure(IllegalStateException("Failed to accept all knock requests"))
+            Result.failure(KnockRequestsException.AcceptAllPartiallyFailed)
         }
     }
 
@@ -140,6 +140,6 @@ class KnockRequestsService(
                 }
             }
     }
-
-    private fun knockRequestNotFoundResult() = Result.failure<Unit>(IllegalArgumentException("Knock request not found"))
 }
+
+private fun knockRequestNotFoundResult() = Result.failure<Unit>(KnockRequestsException.KnockRequestNotFound)