diff --git a/server/website/website/db/base/target_objective.py b/server/website/website/db/base/target_objective.py
index 169e499..8b77b21 100644
--- a/server/website/website/db/base/target_objective.py
+++ b/server/website/website/db/base/target_objective.py
@@ -95,7 +95,7 @@ class UserDefinedTargetObjective(BaseTargetObjective):
         self.pprint = pprint
 
     def compute(self, metrics, observation_time):
-        return metrics[self.name]
+        return metrics.get(self.name, 0)
 
 class TargetObjectives:
     LESS_IS_BETTER = LESS_IS_BETTER