diff --git a/spinn_front_end_common/interface/abstract_spinnaker_base.py b/spinn_front_end_common/interface/abstract_spinnaker_base.py
index 5edfb61448..c023b6aa42 100644
--- a/spinn_front_end_common/interface/abstract_spinnaker_base.py
+++ b/spinn_front_end_common/interface/abstract_spinnaker_base.py
@@ -2246,7 +2246,7 @@ def __recover_from_error(self, exception):
         # Find the cores that are not in RTE i.e. that can still be read
         non_rte_cores = [
             (x, y, p)
-            for (x, y, p), core_info in unsuccessful_cores.items()
+            for (x, y, p), core_info in unsuccessful_cores
             if (core_info.state != CPUState.RUN_TIME_EXCEPTION and
                 core_info.state != CPUState.WATCHDOG)]