diff --git a/app/scrapers/axis.py b/app/scrapers/axis.py
index 31ca7b1..4a9c290 100644
--- a/app/scrapers/axis.py
+++ b/app/scrapers/axis.py
@@ -268,7 +268,7 @@ def fetch_data(
 
     @staticmethod
     def parse_details(expense: Expense) -> Transaction:
-        details = expense.details.replace("M/s", "M.s")
+        details = str(expense.details).replace("M/s", "M.s")
         axis_id = os.getenv("AXIS_CUSTOMID", "")
         if details.startswith("UPIRECONP2PM/"):
             _, transaction_id, _ = (each.strip() for each in details.split("/", 2))
@@ -291,8 +291,8 @@ def parse_details(expense: Expense) -> Transaction:
             extra = details.split()[-1]
             to_name_ctf = re.search("[A-Z]+", extra)
             to_name_str = to_name_ctf.group() if to_name_ctf else ""
-            transaction_id = re.search("[0-9]+", extra)
-            transaction_id = transaction_id.group() if transaction_id else ""
+            transaction_id_ = re.search("[0-9]+", extra)
+            transaction_id = transaction_id_.group() if transaction_id_ else ""
             transaction = Transaction(
                 transaction_type="UPI",
                 transaction_id=transaction_id,
@@ -496,7 +496,7 @@ def fetch_data(
 
     @staticmethod
     def parse_details(expense: Expense) -> Transaction:
-        details = expense.details
+        details = str(expense.details)
         merchant = details.split(",", 1)[0]
         ignore = bool(details.startswith("MB PAYMENT"))
         return Transaction(
diff --git a/app/scrapers/base.py b/app/scrapers/base.py
index 769bc92..1e2d31a 100644
--- a/app/scrapers/base.py
+++ b/app/scrapers/base.py
@@ -23,7 +23,8 @@ class Transaction:
 class Source:
     name = "base"
     columns: dict[str, None | str | list[str]] = {}
-    date_format: str | None = None
+    date_format: str = ""
+    dtypes: dict[str, str] = {}
 
     @staticmethod
     def parse_details(expense: Expense) -> Transaction:
diff --git a/app/scrapers/cash.py b/app/scrapers/cash.py
index 92673d8..baf9b55 100644
--- a/app/scrapers/cash.py
+++ b/app/scrapers/cash.py
@@ -36,7 +36,7 @@ def fetch_data(
 
     @staticmethod
     def parse_details(expense: Expense) -> Transaction:
-        details = expense.details
+        details = str(expense.details)
         remarks, category_name = (each.strip() for each in details.split("/"))
         return Transaction(
             transaction_type="Cash",