diff --git a/main.py b/main.py
index 74b7bfa..accd907 100644
--- a/main.py
+++ b/main.py
@@ -1,7 +1,3 @@
 import okama as ok
 
-ccy = 'RUB'
-ls = ['RGBITR.INDX', 'MCFTR.INDX', 'SPY.US', 'PGJ.US', 'GLD.US']
-cons_weights=[0.65, 0.06, 0.19, 0.05, 0.05]
-port_cons_no_infl = ok.Portfolio(ls, ccy=ccy, weights=cons_weights, inflation=False)
-print(port_cons_no_infl.percentile_from_history(years=8))
+print(ok.Asset('SPY.US'))
diff --git a/okama/api/api_methods.py b/okama/api/api_methods.py
index 693ce26..fbb7307 100644
--- a/okama/api/api_methods.py
+++ b/okama/api/api_methods.py
@@ -47,14 +47,18 @@ def connect(
         params = {"first_date": first_date, "last_date": last_date, "period": period}
         session.mount("https://", adapter)
         session.mount("http://", adapter)
-        r = session.get(request_url, params=params, verify=False, timeout=cls.default_timeout)
-        if r.status_code != requests.codes.ok:
-            raise Exception(
-                f"Error fetching data for {symbol}:",
+        try:
+            r = session.get(request_url, params=params, verify=False, timeout=cls.default_timeout)
+            r.raise_for_status()
+        except requests.exceptions.HTTPError as errh:
+            if r.status_code == 404:
+                raise requests.exceptions.HTTPError(f"{symbol} is not found in the database.") from errh
+            raise requests.exceptions.HTTPError(
+                f"HTTP error fetching data for {symbol}:",
                 r.status_code,
                 r.reason,
                 request_url,
-            )
+            ) from errh
         return r.text
 
     @classmethod
diff --git a/tests/test_asset_list.py b/tests/test_asset_list.py
index 5ebef57..bb7a4cc 100644
--- a/tests/test_asset_list.py
+++ b/tests/test_asset_list.py
@@ -203,8 +203,8 @@ def test_get_cumulative_return(self, input_data, expected1, expected2, expected3
 
     cumulative_testdata2 = [
         ("YTD", -0.0614, -0.0674),
-        (1, -0.1383, 0.1863),
-        (None, -0.1912, 0.2530),
+        (1, -0.1383, 0.1745),
+        (None, -0.1912, 0.2406),
     ]
 
     @mark.parametrize(
diff --git a/tests/test_portfolio.py b/tests/test_portfolio.py
index 71e1a38..dc77932 100644
--- a/tests/test_portfolio.py
+++ b/tests/test_portfolio.py
@@ -179,7 +179,7 @@ def test_get_cagr_real_no_inflation_exception(portfolio_no_inflation):
 
 @mark.parametrize(
     "period, real, expected",
-    [("YTD", False, 0.01505), (1, False, 0.12269), (2, True, 0.1381)],
+    [("YTD", False, 0.01505), (1, False, 0.12269), (2, True, 0.1268)],
 )
 def test_cumulative_return(portfolio_rebalanced_month, period, real, expected):
     assert portfolio_rebalanced_month.get_cumulative_return(