diff --git a/src/pytesmo/validation_framework/metric_calculators_adapters.py b/src/pytesmo/validation_framework/metric_calculators_adapters.py
index 3425489..0044770 100644
--- a/src/pytesmo/validation_framework/metric_calculators_adapters.py
+++ b/src/pytesmo/validation_framework/metric_calculators_adapters.py
@@ -133,7 +133,7 @@ def calc_metrics(self, data, gpi_info):
 
         for setname, distr in self.subsets.items():
             if len(data.index) == 0:
-                df = pd.DataFrame()
+                df = data
             else:
                 df = distr.select(data)
             ds = self.cls.calc_metrics(df, gpi_info=gpi_info)