Update app.py

app.py

@@ -61,6 +61,9 @@ def chat_inf(system_prompt,prompt,history,memory,client_choice,seed,temp,tokens,
     if not history:
         history = []
         hist_len=0
+    if not memory:
+        memory = []
+        mem_len=0        
     if memory:
         for ea in memory[0-chat_mem:]:
             hist_len+=len(str(ea))