diff --git a/src/utils/config.ts b/src/utils/config.ts
index 3405fb8..8e64e42 100644
--- a/src/utils/config.ts
+++ b/src/utils/config.ts
@@ -15,7 +15,7 @@ const defaults = {
   youtube_videoid: '',
   animation_url: process.env.NEXT_PUBLIC_ANIMATION_URL ?? '/animations/idle_loop.vrma',
   voice_url: process.env.NEXT_PUBLIC_VOICE_URL ?? '',
-  chatbot_backend: process.env.NEXT_PUBLIC_CHATBOT_BACKEND 'openai',
+  chatbot_backend: process.env.NEXT_PUBLIC_CHATBOT_BACKEND ?? 'openai',
   openai_apikey: process.env.NEXT_PUBLIC_OPENAI_APIKEY ?? 'default',
   openai_url: process.env.NEXT_PUBLIC_OPENAI_URL ?? 'https://i-love-amica.com',
   openai_model: process.env.NEXT_PUBLIC_OPENAI_MODEL ?? 'mlabonne/NeuralDaredevil-8B-abliterated,
@@ -27,7 +27,7 @@ const defaults = {
   koboldai_use_extra: process.env.NEXT_PUBLIC_KOBOLDAI_USE_EXTRA ?? 'false',
   koboldai_stop_sequence: process.env.NEXT_PUBLIC_KOBOLDAI_STOP_SEQUENCE ?? '(End)||[END]||Note||***||You:||User:||</s>',
   tts_muted: 'false',
-  tts_backend: process.env.NEXT_PUBLIC_TTS_BACKEND 'piper',
+  tts_backend: process.env.NEXT_PUBLIC_TTS_BACKEND ?? 'piper',
   stt_backend: process.env.NEXT_PUBLIC_STT_BACKEND ?? 'whisper_browser',
   vision_backend: process.env.NEXT_PUBLIC_VISION_BACKEND ?? 'none',
   vision_system_prompt: process.env.NEXT_PUBLIC_VISION_SYSTEM_PROMPT ?? `You are a friendly human named Amica. Describe the image in detail. Let's start the conversation.`,