diff --git a/src/pages/journal/trading_journal_page.py b/src/pages/journal/trading_journal_page.py
index 74e98e8..e16280e 100644
--- a/src/pages/journal/trading_journal_page.py
+++ b/src/pages/journal/trading_journal_page.py
@@ -27,7 +27,12 @@ def plot_trade_history(trades):
     
     for trade in trades:
         if trade['exit_price']:
-            trade_pnl = (trade['exit_price'] - trade['entry_price']) * trade['shares']
+            # Convert prices to float if they're strings
+            exit_price = float(trade['exit_price'])
+            entry_price = float(trade['entry_price'])
+            shares = float(trade['shares'])
+            
+            trade_pnl = (exit_price - entry_price) * shares
             cumulative_pnl += trade_pnl
             dates.append(trade['exit_date'])
             pnl.append(cumulative_pnl)