diff --git a/tabbycat/results/result.py b/tabbycat/results/result.py
index 18470d1350d..d3ab76cc291 100644
--- a/tabbycat/results/result.py
+++ b/tabbycat/results/result.py
@@ -927,7 +927,12 @@ def save(self):
                         defaults=self.get_defaults_fields('speakerscorebyadj', adj, side, pos))
 
     def set_score(self, adjudicator, side, position, score):
-        self.scoresheets[adjudicator].set_score(side, position, score)
+        try:
+            self.scoresheets[adjudicator].set_score(side, position, score)
+        except KeyError:
+            logger.exception("Tried to set score by adjudicator %s, but this adjudicator "
+                "doesn't have a scoresheet.", adjudicator)
+            return
 
     # --------------------------------------------------------------------------
     # Model fields