diff --git a/src/matrixcommandhandler.ts b/src/matrixcommandhandler.ts
index 5c726899fd001fabc9e84a08d24fd88477904059..923299892cc05f7439c8d84aa61a9fa7d758dd4b 100644
--- a/src/matrixcommandhandler.ts
+++ b/src/matrixcommandhandler.ts
@@ -74,7 +74,7 @@ export class MatrixCommandHandler {
                     selfService: true,
                     //subcat: "m.room.power_levels",
                     // use default power level (50)
-                    subcat: null,
+                    subcat: "null",
                 },
                 run: async ({guildId, channelId}) => {
                     if (roomEntry && roomEntry.remote) {