diff --git a/app/models/samples_report.rb b/app/models/samples_report.rb
index d3c01ed8c..846e6767b 100644
--- a/app/models/samples_report.rb
+++ b/app/models/samples_report.rb
@@ -76,7 +76,8 @@ def calculate_lod_and_lob
 
   # Returns any sample that isn't a distractor.
   def target_sample
-    samples.where.not(distractor: true).take!
+    target_sample = samples.find_by("distractor IS NULL or distractor = ?", false)
+    target_sample ||= samples.take
   end
 
   private