diff --git a/rowers/models.py b/rowers/models.py
index acfea0e0..56af4950 100644
--- a/rowers/models.py
+++ b/rowers/models.py
@@ -4969,7 +4969,7 @@ class ShareKey(models.Model):
 
 class InStrokeAnalysis(models.Model):
     workout = models.ForeignKey(Workout, on_delete=models.CASCADE)
-    rower = models.ForeignKey(Rower, on_delete=models.CASCADE)
+    rower = models.ForeignKey(Rower, on_delete=models.SET_NULL, null=True)
     metric = models.CharField(max_length=140, blank=True, null=True)
     name = models.CharField(max_length=150, blank=True, null=True)
     date = models.DateField(blank=True, null=True)