diff --git a/core/utils.py b/core/utils.py
index 8cbbda2..4d0de2f 100644
--- a/core/utils.py
+++ b/core/utils.py
@@ -66,7 +66,7 @@ def chaosmonkey(n):
 # handles url or file, so we can refer to a set of scans (not drawings) on another server
 def GetListDir(sdir):
     res = [ ]
-    if sdir[:7] == "http://":
+    if type(sdir) is str and sdir[:7] == "http://":
         # s = urllib.request.urlopen(sdir)
         message = f"! Requesting loading from http:// NOT IMPLEMENTED. [{sdir}]"         
         print(message)