diff --git a/dxfeed/core/DXFeedPy.pyx b/dxfeed/core/DXFeedPy.pyx
index fddb1f3..deb1d1d 100644
--- a/dxfeed/core/DXFeedPy.pyx
+++ b/dxfeed/core/DXFeedPy.pyx
@@ -231,7 +231,7 @@ def dxf_create_subscription(ConnectionClass cc, event_type: str, candle_time: Op
         candle_time = datetime.strptime(candle_time, '%Y-%m-%d %H:%M:%S') if candle_time else datetime.utcnow()
         timestamp = int((candle_time - datetime(1970, 1, 1)).total_seconds()) * 1000 - 5000
     except ValueError:
-        raise Exception("Inapropriate date format, should be %Y-%m-%d %H:%M:%S")
+        raise Exception("Inappropriate date format, should be %Y-%m-%d %H:%M:%S")
 
     if event_type == 'Candle':
         clib.dxf_create_subscription_timed(sc.connection, et_type_int, timestamp, &sc.subscription)
@@ -370,11 +370,11 @@ def dxf_close_connection(ConnectionClass cc):
     cc: ConnectionClass
         Variable with connection information
     """
-    related_subs = cc.get_sub_refs()
-    for sub in related_subs:
-        dxf_close_subscription(sub)
-
     if cc.connection:
+        related_subs = cc.get_sub_refs()
+        for sub in related_subs:
+            dxf_close_subscription(sub)
+
         clib.dxf_close_connection(cc.connection)
         cc.connection = NULL