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-rwxr-xr-xwqflask/base/data_set.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/wqflask/base/data_set.py b/wqflask/base/data_set.py
index e98258f6..e2db9ad7 100755
--- a/wqflask/base/data_set.py
+++ b/wqflask/base/data_set.py
@@ -1171,7 +1171,8 @@ class MrnaAssayDataSet(DataSet):
             
             mean = result[0] if result else 0
 
-            this_trait.mean = "%2.3f" % mean
+            if mean:
+                this_trait.mean = "%2.3f" % mean
 
             #LRS and its location
             this_trait.LRS_score_repr = 'N/A'