diff --git a/frb/surveys/decals.py b/frb/surveys/decals.py
index 03cb18ef..ebc4aa55 100644
--- a/frb/surveys/decals.py
+++ b/frb/surveys/decals.py
@@ -77,7 +77,10 @@ def get_catalog(self, query=None, query_fields=None, print_query=False,exclude_g
         main_cat = Table(main_cat,masked=True)
         #
         for col in main_cat.colnames:
-            main_cat[col].mask = np.isnan(main_cat[col])
+            try:
+                main_cat[col].mask = np.isnan(main_cat[col])
+            except TypeError:
+                pass
         #Convert SNR to mag error values.
         snr_cols = [colname for colname in main_cat.colnames if "snr" in colname]
         for col in snr_cols: