diff --git a/gseapy/enrichr.py b/gseapy/enrichr.py
index dfca81e..9b9742e 100644
--- a/gseapy/enrichr.py
+++ b/gseapy/enrichr.py
@@ -291,8 +291,7 @@ def get_results_with_background(
         response = s.post(BGENR_URL, data=payload)
         if not response.ok:
             self._logger.error("Error fetching enrichment results: %s" % self._gs)
-
-        data = response.json(allow_nan=True)
+        data = response.json()
         # Note: missig Overlap column
         colnames = [
             "Rank",