diff --git a/packages/frontend/src/pages/rooms/room.core.vue b/packages/frontend/src/pages/rooms/room.core.vue
index a69f7e26c2..8e69ca9593 100644
--- a/packages/frontend/src/pages/rooms/room.core.vue
+++ b/packages/frontend/src/pages/rooms/room.core.vue
@@ -229,6 +229,16 @@ const joyStickStartPos = ref<{ x: number; y: number } | null>(null);
 let latestSavedRoomState = deepClone(props.room.def) as unknown as RoomState;
 let initialRoomState = latestSavedRoomState;
 
+// 後方互換性のため
+for (const obj of latestSavedRoomState.installedObjects) {
+	if (obj.options.customPicture != null) {
+		obj.options.image = {
+			type: null,
+		};
+		delete obj.options.customPicture;
+	}
+}
+
 let latestSavedAttachments = {
 	files: deepClone(props.room.attachedFiles),
 } as RoomAttachments;