diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/query/SpaceFilter.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/query/SpaceFilter.kt
index 237f9388f2..6383412ffb 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/query/SpaceFilter.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/query/SpaceFilter.kt
@@ -36,3 +36,8 @@ sealed interface SpaceFilter {
      */
     data class ExcludeSpace(val spaceId: String) : SpaceFilter
 }
+
+/**
+ * Return a [SpaceFilter.ActiveSpace] if the String is not null, or [SpaceFilter.OrphanRooms].
+ */
+fun String?.toActiveSpaceOrOrphanRooms(): SpaceFilter = this?.let { SpaceFilter.ActiveSpace(it) } ?: SpaceFilter.OrphanRooms
diff --git a/vector/src/main/java/im/vector/app/features/home/HomeDetailViewModel.kt b/vector/src/main/java/im/vector/app/features/home/HomeDetailViewModel.kt
index 5044e71a50..30bff45cbd 100644
--- a/vector/src/main/java/im/vector/app/features/home/HomeDetailViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/home/HomeDetailViewModel.kt
@@ -47,6 +47,7 @@ import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import org.matrix.android.sdk.api.query.RoomCategoryFilter
 import org.matrix.android.sdk.api.query.SpaceFilter
+import org.matrix.android.sdk.api.query.toActiveSpaceOrOrphanRooms
 import org.matrix.android.sdk.api.session.Session
 import org.matrix.android.sdk.api.session.crypto.NewSessionListener
 import org.matrix.android.sdk.api.session.initsync.SyncStatusService
@@ -249,7 +250,7 @@ class HomeDetailViewModel @AssistedInject constructor(
                                         roomSummaryQueryParams {
                                             memberships = listOf(Membership.INVITE)
                                             roomCategoryFilter = RoomCategoryFilter.ONLY_ROOMS
-                                            spaceFilter = groupingMethod.spaceSummary?.roomId?.let { SpaceFilter.ActiveSpace(it) } ?: SpaceFilter.OrphanRooms
+                                            spaceFilter = groupingMethod.toActiveSpaceOrOrphanRooms()
                                         }
                                 ).size
                             }
@@ -266,7 +267,7 @@ class HomeDetailViewModel @AssistedInject constructor(
                                     roomSummaryQueryParams {
                                         memberships = listOf(Membership.JOIN)
                                         roomCategoryFilter = RoomCategoryFilter.ONLY_ROOMS
-                                        spaceFilter = groupingMethod.spaceSummary?.roomId?.let { SpaceFilter.ActiveSpace(it) } ?: SpaceFilter.OrphanRooms
+                                        spaceFilter = groupingMethod.toActiveSpaceOrOrphanRooms()
                                     }
                             )
 
@@ -287,4 +288,8 @@ class HomeDetailViewModel @AssistedInject constructor(
                 }
                 .launchIn(viewModelScope)
     }
+
+    private fun RoomGroupingMethod.BySpace.toActiveSpaceOrOrphanRooms(): SpaceFilter? {
+        return spaceSummary?.roomId?.toActiveSpaceOrOrphanRooms()
+    }
 }
diff --git a/vector/src/main/java/im/vector/app/features/home/room/list/RoomListSectionBuilderSpace.kt b/vector/src/main/java/im/vector/app/features/home/room/list/RoomListSectionBuilderSpace.kt
index c001b69121..08ecca8c6a 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/list/RoomListSectionBuilderSpace.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/list/RoomListSectionBuilderSpace.kt
@@ -46,6 +46,7 @@ import org.matrix.android.sdk.api.extensions.tryOrNull
 import org.matrix.android.sdk.api.query.RoomCategoryFilter
 import org.matrix.android.sdk.api.query.RoomTagQueryFilter
 import org.matrix.android.sdk.api.query.SpaceFilter
+import org.matrix.android.sdk.api.query.toActiveSpaceOrOrphanRooms
 import org.matrix.android.sdk.api.session.Session
 import org.matrix.android.sdk.api.session.getRoomSummary
 import org.matrix.android.sdk.api.session.room.RoomSummaryQueryParams
@@ -370,7 +371,7 @@ class RoomListSectionBuilderSpace(
                     activeSpaceUpdaters.add(object : RoomListViewModel.ActiveSpaceQueryUpdater {
                         override fun updateForSpaceId(roomId: String?) {
                             filteredPagedRoomSummariesLive.queryParams = roomQueryParams.copy(
-                                    spaceFilter = roomId?.let { SpaceFilter.ActiveSpace(it) } ?: SpaceFilter.OrphanRooms
+                                    spaceFilter = roomId?.toActiveSpaceOrOrphanRooms()
                             )
                             liveQueryParams.update { filteredPagedRoomSummariesLive.queryParams }
                         }
@@ -436,7 +437,7 @@ class RoomListSectionBuilderSpace(
         return when (spaceFilter) {
             RoomListViewModel.SpaceFilterStrategy.ORPHANS_IF_SPACE_NULL -> {
                 copy(
-                        spaceFilter = currentSpace?.let { SpaceFilter.ActiveSpace(it) } ?: SpaceFilter.OrphanRooms
+                        spaceFilter = currentSpace?.toActiveSpaceOrOrphanRooms()
                 )
             }
             RoomListViewModel.SpaceFilterStrategy.ALL_IF_SPACE_NULL     -> {