Lets fix this

controller.py

@@ -269,7 +269,7 @@ def langchain_csv_chat(csv_url: str, question: str, chart_required: bool):
             # if "429" in error_message:
             if error_message != "":
                 with current_langchain_chart_lock:
-                    current_langchain_chart_key_index = (current_langchain_chart_key_index + 1) % len(groq_api_keys)
+                    current_langchain_chart_key_index = (current_langchain_chart_key_index + 1)
                     logger.warning(f"Rate limit exceeded. Switching to next API key: {groq_api_keys[current_langchain_chart_key_index]}")
             else:
                 logger.error(f"Error with API key {api_key}: {error_message}")
@@ -408,7 +408,7 @@ def groq_chart(csv_url: str, question: str):
             # if "429" in error:
             if error != "":
                 with current_groq_chart_lock:
-                    current_groq_chart_key_index = (current_groq_chart_key_index + 1) % len(groq_api_keys)
+                    current_groq_chart_key_index = (current_groq_chart_key_index + 1)
             else:
                 logger.error(f"Chart generation error: {error}")
                 return {"error": error}
@@ -751,7 +751,7 @@ def langchain_csv_chart(csv_url: str, question: str, chart_required: bool):
             error_message = str(e)
             if error_message != "":
                 with current_langchain_chart_lock:
-                    current_langchain_chart_key_index = (current_langchain_chart_key_index + 1) % len(groq_api_keys)
+                    current_langchain_chart_key_index = (current_langchain_chart_key_index + 1)
                     logger.warning(f"Rate limit exceeded. Switching to next API key: {groq_api_keys[current_langchain_chart_key_index]}")
             else:
                 logger.error(f"Error with API key {api_key}: {error_message}")