diff --git a/modules/chat.py b/modules/chat.py
index 920c0f7b..6640776f 100644
--- a/modules/chat.py
+++ b/modules/chat.py
@@ -577,7 +577,7 @@ def find_all_histories_with_first_prompts(state):
                 data = json.load(f)
 
                 first_prompt = ""
-                if 'visible' in data and len(data['visible']) > 0:
+                if data and 'visible' in data and len(data['visible']) > 0:
                     if data['internal'][0][0] == '<|BEGIN-VISIBLE-CHAT|>':
                         if len(data['visible']) > 1:
                             first_prompt = html.unescape(data['visible'][1][0])
diff --git a/modules/llama_cpp_python_hijack.py b/modules/llama_cpp_python_hijack.py
index f3f3f560..c9813708 100644
--- a/modules/llama_cpp_python_hijack.py
+++ b/modules/llama_cpp_python_hijack.py
@@ -100,9 +100,11 @@ def eval_with_progress(self, tokens: Sequence[int]):
 
 
 def monkey_patch_llama_cpp_python(lib):
+    if getattr(lib.Llama, '_is_patched', False):
+        # If the patch is already applied, do nothing
+        return
 
     def my_generate(self, *args, **kwargs):
-
         if shared.args.streaming_llm:
             new_sequence = args[0]
             past_sequence = self._input_ids
@@ -116,3 +118,6 @@ def monkey_patch_llama_cpp_python(lib):
     lib.Llama.eval = eval_with_progress
     lib.Llama.original_generate = lib.Llama.generate
     lib.Llama.generate = my_generate
+
+    # Set the flag to indicate that the patch has been applied
+    lib.Llama._is_patched = True