diff --git a/sktools/src/sktools/common.py b/sktools/src/sktools/common.py
index 8e3aa313..15610dae 100644
--- a/sktools/src/sktools/common.py
+++ b/sktools/src/sktools/common.py
@@ -528,11 +528,12 @@ def is_shelf_file_matching(shelf_file, mydict):
         db = shelve.open(shelf_file, 'r')
     except dbm.error:
         return False
-    if not type(db) is type(mydict):
-        return False
     match = True
     for key in mydict:
-        match = key in db and db[key] == mydict[key]
+        try:
+            match = key in db and db[key] == mydict[key]
+        except KeyError:
+            match = False
         if not match:
             return False
     return True