diff --git a/controldeck.py b/controldeck.py
index 697cf77..0895ad6 100755
--- a/controldeck.py
+++ b/controldeck.py
@@ -297,7 +297,10 @@ class Slider(Div):
     badge_name = self.description if self.description else self.name
     value = self.min
     if self.state_command:
-      value = float(process(self.state_command, shell=True))
+      try:
+        value = float(process(self.state_command, shell=True))
+      except Exception as e:
+        print(e)
 
     # 1st row; badge
     badge = QBadge(