diff --git a/src/handlers.ts b/src/handlers.ts
index 386571c..b3470ea 100644
--- a/src/handlers.ts
+++ b/src/handlers.ts
@@ -17,11 +17,9 @@ export async function handleRoomEvent(client: MatrixClient, chatGPT: ChatGPTAPIB
         const rootEventId: string = (relatesTo !== undefined && relatesTo.event_id !== undefined) ? relatesTo.event_id : event.event_id;
         const storedValue: string = await client.storageProvider.readValue('gpt-' + rootEventId)
         const storedConversation: StoredConversation = (storedValue !== undefined) ? JSON.parse(storedValue) : undefined;
-        const config = (storedConversation !== undefined && storedConversation.config !== undefined) ? storedConversation.config : undefined;
-
-        const MATRIX_PREFIX_REPLY = (config === undefined) ? MATRIX_DEFAULT_PREFIX_REPLY : config.MATRIX_PREFIX_REPLY
-        const shouldBePrefixed: boolean = ((Boolean(MATRIX_DEFAULT_PREFIX)) && (MATRIX_PREFIX_REPLY || (relatesTo === undefined)));
-
+        const config = (storedConversation !== undefined && storedConversation.config !== undefined) ? storedConversation.config : {};
+        const MATRIX_PREFIX_REPLY = (config.MATRIX_PREFIX_REPLY === undefined) ? MATRIX_DEFAULT_PREFIX_REPLY : config.MATRIX_PREFIX_REPLY
+        const shouldBePrefixed: boolean = ((MATRIX_DEFAULT_PREFIX) && (relatesTo === undefined)) || (MATRIX_PREFIX_REPLY && (relatesTo !== undefined));
         if (event.sender === MATRIX_BOT_USERNAME) return;                                       // Don't reply to ourself
         if (Date.now() - event.origin_server_ts > 10000) return;                                // Don't reply to old messages
         if (shouldBePrefixed && !event.content.body.startsWith(MATRIX_DEFAULT_PREFIX)) return;  // Don't reply without prefix if prefixed