diff --git a/config.py b/config.py
index 1fca9d5..dbd24c7 100644
--- a/config.py
+++ b/config.py
@@ -6,16 +6,27 @@ load_dotenv()
 
 
 def str2bool(v):
-  return v.lower() in ("yes", "true", "t", "1")
+  return v.lower() in ("yes", "true", "t", "1", "on")
 
 
 class Config():
-    ESPN_S2 = getenv("ESPN_S2")
-    LEAGUE_ID = getenv("LEAGUE_ID")
-    SWID = getenv("SWID")
-    FETCH_LEAGUE = str2bool(getenv("FETCH_LEAGUE"))
-    SPREADSHEET_ID = getenv("SPREADSHEET_ID")
-    WORKSHEET_NAME = getenv("WORKSHEET_NAME")
+
+  def __init__(self) -> None:
+    self.ESPN_S2 = getenv("ESPN_S2", 0)
+    self.LEAGUE_ID = int(getenv("LEAGUE_ID", 0))
+    self.SWID = getenv("SWID", 0)
+    self.FETCH_LEAGUE = str2bool(getenv("FETCH_LEAGUE", 0))
+    self.SPREADSHEET_ID = getenv("SPREADSHEET_ID", 0)
+    self.SHEET_NAME = getenv("WORKSHEET_NAME", 0)
+    self.check_values()
+
+  def check_values(self):
+    for attribute, value in self.__dict__.items():
+      if value == 0:
+        raise Exception("ERROR: Unproperly set environment variable {attribute}, please review".format(attribute=attribute))
 
 
-cfg = Config()
+try:
+  cfg = Config()
+except Exception as e:
+  print(e)
\ No newline at end of file