diff --git a/backend/app.py b/backend/app.py
index e50dd50..08895be 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -827,10 +827,10 @@ async def get_data_info(request: Request):
             "data_source": "PostgreSQL",
         }
 
-    years = [int(y) for y in sorted(df["year"].unique())]
+    years = [int(y) for y in sorted(df["year"].dropna().unique())]
     schools_per_year = {
         str(int(k)): int(v)
-        for k, v in df.groupby("year")["urn"].nunique().to_dict().items()
+        for k, v in df.dropna(subset=["year"]).groupby("year")["urn"].nunique().to_dict().items()
     }
     la_counts = {
         str(k): int(v)