diff --git a/daqviewer/daqviewer.py b/daqviewer/daqviewer.py
index d822a73..8385886 100644
--- a/daqviewer/daqviewer.py
+++ b/daqviewer/daqviewer.py
@@ -164,6 +164,8 @@ def update_output(contents, names, dates):
         ]
 
         return children
+    else:
+        return [html.Div([])]
 
 
 def main():