diff --git a/libs/utils/energy.py b/libs/utils/energy.py
index 9e78f45cff9789eae46b514b971f8f6963867598..302349da374fea1bea5f340c09bc57c875ce8cde 100644
--- a/libs/utils/energy.py
+++ b/libs/utils/energy.py
@@ -195,11 +195,11 @@ class HWMon(EnergyMeter):
         # Reformat data for output generation
         clusters_nrg = {}
         for channel in self._channels:
-            if channel not in nrg:
+            label = self._channels[channel]
+            if label not in nrg:
                 raise RuntimeError('hwmon channel "{}" not available. '
                                    'Selected channels: {}'.format(
                                        channel, nrg.keys()))
-            label = self._channels[channel]
             nrg_total = nrg[label]['total']
             self._log.debug('Energy [%16s]: %.6f', label, nrg_total)
             clusters_nrg[channel] = nrg_total