fix for AttributeError

if not state.is_db_ready(): AttributeError: 'NoneType' object has no attribute 'is_db_ready'

app.py

@@ -42,7 +42,7 @@ def new_session():
 def process_pdf(pdf_file, state):
     try:
         # Check if a PDF has already been processed in this session
-        if state.is_db_ready():
+        if state and state.is_db_ready():
             return (
                 gr.update(interactive=False),
                 gr.update(visible=True),
@@ -95,7 +95,8 @@ def process_pdf(pdf_file, state):
 
 # Function to handle user queries
 def chat_with_pdf(message, history, state):
-    if not state.is_db_ready():
+    # Add a defensive check for the state object itself
+    if not state or not state.is_db_ready():
         yield "Please upload a PDF first to begin the conversation."
         return