diff --git a/pydsf.py b/pydsf.py
index ba7ff93..545eb6e 100644
--- a/pydsf.py
+++ b/pydsf.py
@@ -431,7 +431,7 @@ class Plate:
                     if read > 0:
                         try:
                             temp[read - 1] = row[read]
-                        except IndexError:
+                        except (IndexError, ValueError):
                             temp[read - 1] = 0.0
                     elif read == 0:
                         self.wells[i].name = row[read]