diff --git a/tabellio/searchform/form.py b/tabellio/searchform/form.py
index 08f2c48..3bb4420 100644
--- a/tabellio/searchform/form.py
+++ b/tabellio/searchform/form.py
@@ -772,7 +772,10 @@ class SearchView(BrowserView):
 
         def get_no_as_int(i):
             if i:
-                return int(i.split('-')[0])
+                try:
+                    return int(i.split('-')[0])
+                except ValueError:
+                    return 99999
             return 0
 
         def cmp_dostype(x, y):