diff --git a/g4f/Provider/Aivvm.py b/g4f/Provider/Aivvm.py
index 02b6c2b4..5cd91546 100644
--- a/g4f/Provider/Aivvm.py
+++ b/g4f/Provider/Aivvm.py
@@ -47,7 +47,7 @@ class Aivvm(AsyncGeneratorProvider):
             async with session.post(f"{cls.url}/api/chat", json=json_data) as response:
                 response.raise_for_status()
                 async for chunk in response.content.iter_any():
-                    yield chunk.decode('utf-8')
+                    yield chunk.decode()
 
     @classmethod
     @property
diff --git a/g4f/Provider/PerplexityAi.py b/g4f/Provider/PerplexityAi.py
index 6e95fd51..612e2d98 100644
--- a/g4f/Provider/PerplexityAi.py
+++ b/g4f/Provider/PerplexityAi.py
@@ -11,7 +11,7 @@ from .base_provider import AsyncProvider, format_prompt, get_cookies
 
 class PerplexityAi(AsyncProvider):
     url                   = "https://www.perplexity.ai"
-    working               = True
+    working               = False
     supports_gpt_35_turbo = True
     _sources              = []