total_exp = str(total_exp) for startswith

app.py

@@ -294,6 +294,7 @@ async def add_exp(member_id):
                     global_df.loc[index, 'discord_exp'] = new_xp # do not change column name
 
                     # after
+                    total_exp = str(total_exp)
                     if not total_exp.startswith("L") and not total_exp.endswith("L"): 
                         total_exp = f"L" + str(total_exp) + f"L"