diff --git a/ee/api/routers/saml.py b/ee/api/routers/saml.py
index ae7d3171e..dd7819f9e 100644
--- a/ee/api/routers/saml.py
+++ b/ee/api/routers/saml.py
@@ -35,8 +35,17 @@ async def process_sso_assertion(request: Request):
     session = req["cookie"]["session"]
     auth = init_saml_auth(req)
 
-    redirect_to_link2 = json.loads(req.get("post_data", {}) \
-                                   .get('RelayState', '{}')).get("iFrame")
+    post_data = req.get("post_data")
+    if post_data is None:
+        post_data = {}
+    elif isinstance(post_data, str):
+        post_data = json.loads(post_data)
+    elif not isinstance(post_data, dict):
+        logger.error("Received invalid post_data")
+        logger.error("type: {}".format(type(post_data)))
+        logger.error(post_data)
+
+    redirect_to_link2 = post_data.get('RelayState', {}).get("iFrame")
     request_id = None
     if 'AuthNRequestID' in session:
         request_id = session['AuthNRequestID']