diff --git a/src/matrixcommandhandler.ts b/src/matrixcommandhandler.ts
index faa7e1cb4c39d13e420dba16218f2ec6d189bb7a..1394018b0fa69491cb22ca91816c3d96cada72c8 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) {