diff --git a/Web/conf.py b/Web/conf.py
index c6b46a83..56ea686d 100644
--- a/Web/conf.py
+++ b/Web/conf.py
@@ -263,6 +263,8 @@ edit_on_github_path_prefix = 'Web'
 # of the sidebar.
 html_logo = "_static/CoolPropLogo.png"
 
+assert(Path(html_logo).exists())
+
 # The name of an image file (within the static path) to use as favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
 # pixels large.