diff --git a/faapi/exceptions.py b/faapi/exceptions.py
index 63326cc..14247b6 100644
--- a/faapi/exceptions.py
+++ b/faapi/exceptions.py
@@ -52,5 +52,11 @@ class NoticeMessage(ParsingError):
     """
 
 
+class ClassicTheme(ParsingError):
+    """
+    The cookies supplied are for an account using the Classic theme. Please change your theme to Modern to use FAAPI.
+    """
+
+
 def _raise_exception(err: BaseException):
     raise err
diff --git a/faapi/parse.py b/faapi/parse.py
index 066d4d3..5bdeb2f 100644
--- a/faapi/parse.py
+++ b/faapi/parse.py
@@ -27,6 +27,7 @@
 from .exceptions import NoTitle
 from .exceptions import ParsingError
 from .exceptions import ServerError
+from .exceptions import ClassicTheme
 
 relative_url: Pattern = re_compile(r"^(?:https?://(?:www\.)?furaffinity\.net)?(.*)")
 mentions_regexp: Pattern = re_compile(r"^(?:(?:https?://)?(?:www\.)?furaffinity\.net)?/user/([^/#]+).*$")
@@ -51,6 +52,8 @@ def parse_page(text: str) -> BeautifulSoup:
 def check_page_raise(page: BeautifulSoup) -> None:
     if page is None:
         raise NonePage
+    elif page.body and "classic" in page.body.attrs.get("data-static-path", ""):
+        raise ClassicTheme
     elif not (title := page.title.text.lower() if page.title else ""):
         raise NoTitle
     elif title.startswith("account disabled"):