diff --git a/udemy/extract.py b/udemy/extract.py
index 829b1d0..ae4de14 100644
--- a/udemy/extract.py
+++ b/udemy/extract.py
@@ -81,7 +81,7 @@ def _login(self, username="", password="", cookies=""):
         # check if we already have session on udemy.
         auth = UdemyAuth()
         is_exists, conf = auth.is_session_exists()
-        if is_exists:
+        if is_exists and username and password:
             logger.info(
                 msg="Using existing session..", new_line=True,
             )
@@ -107,7 +107,6 @@ def _login(self, username="", password="", cookies=""):
             self._cookies = extract_cookie_string(raw_cookies=cookies)
             self._access_token = self._cookies.get("access_token")
             client_id = self._cookies.get("client_id")
-            time.sleep(0.3)
             self._session, _ = auth.authenticate(
                 access_token=self._access_token, client_id=client_id
             )
diff --git a/udemy/logger.py b/udemy/logger.py
index e4d6215..4af1e21 100644
--- a/udemy/logger.py
+++ b/udemy/logger.py
@@ -60,8 +60,12 @@ class Logging(ProgressBar):
         Custom logging class for udemy
     """
 
+    def __init__(self, log_filepath=None):
+        self._log_filepath = log_filepath
+
     def set_log_filepath(self, log_filepath):
         file_handler = logging.FileHandler(log_filepath)
+        self._log_filepath = log_filepath
         logging.basicConfig(
             format="[%(asctime)s][%(name)s] %(levelname)-5.5s %(message)s",
             level=logging.INFO,
@@ -188,7 +192,8 @@ def failed(self, msg):
             + Style.DIM
             + "] : "
         )
-        log.error(msg)
+        if self._log_filepath:
+            log.error(msg)
         msg = (
             set_color(f"{msg} (", level=70)
             + set_color("failed", level=40)
@@ -212,7 +217,8 @@ def warning(self, msg):
             + Style.DIM
             + "] : "
         )
-        log.warning(msg)
+        if self._log_filepath:
+            log.warning(msg)
         msg = set_color(f"{msg}\n", level=70)
         string = prefix + msg
         sys.stdout.write(string)
@@ -232,7 +238,8 @@ def error(self, msg, new_line=False):
             + Style.DIM
             + "] : "
         )
-        log.error(msg)
+        if self._log_filepath:
+            log.error(msg)
         if not new_line:
             msg = set_color(f"{msg}\n", level=40)
             string = prefix + msg
@@ -281,7 +288,8 @@ def download_skipped(self, msg, reason=""):
             + Style.DIM
             + "] : "
         )
-        log.warning(msg)
+        if self._log_filepath:
+            log.warning(msg)
         msg = (
             set_color(f"{msg} (", level=70)
             + set_color("download skipped", level=30)