Resolve "release v1.2.0"

Closes #257 (closed)

mlair/data_handler/data_handler_mixed_sampling.py

@@ -112,7 +112,10 @@ class DataHandlerMixedSamplingWithFilterSingleStation(DataHandlerMixedSamplingSi
         else:  # target
             start, end = self.start, self.end
 
-        data, self.meta = self.load_data(self.path[ind], self.station, self.statistics_per_var, self.sampling[ind],
+        vars = [self.variables, self.target_var]
+        stats_per_var = helpers.select_from_dict(self.statistics_per_var, vars[ind])
+
+        data, self.meta = self.load_data(self.path[ind], self.station, stats_per_var, self.sampling[ind],
                                          self.station_type, self.network, self.store_data_locally, self.data_origin,
                                          start, end)
         data = self.interpolate(data, dim=self.time_dim, method=self.interpolation_method,