diff --git a/djutils/lists.py b/djutils/lists.py
index be57a82..a00567d 100644
--- a/djutils/lists.py
+++ b/djutils/lists.py
@@ -138,9 +138,12 @@ def get(cls, restrictions):
         keys = [cls.key_source.restrict(_).fetch1() for _ in restrictions]
         n = len(keys)
 
-        candidates = cls & f"members = {n}"
-        members = cls.Member & keys
-        key = candidates.aggr(members, n="count(*)") & f"n = {n}"
+        if n:
+            candidates = cls & f"members = {n}"
+            members = cls.Member & keys
+            key = candidates.aggr(members, n="count(*)") & f"n = {n}"
+        else:
+            key = cls & "members = 0"
 
         if key:
             return key.fetch1(dj.key)
diff --git a/djutils/sets.py b/djutils/sets.py
index 5b584ee..c9d38f9 100644
--- a/djutils/sets.py
+++ b/djutils/sets.py
@@ -147,9 +147,12 @@ def get(cls, restriction):
         key = cls.key_source & restriction
         n = len(key)
 
-        candidates = cls & f"members = {n}"
-        members = cls.Member & key
-        key = candidates.aggr(members, n="count(*)") & f"n = {n}"
+        if n:
+            candidates = cls & f"members = {n}"
+            members = cls.Member & key
+            key = candidates.aggr(members, n="count(*)") & f"n = {n}"
+        else:
+            key = cls & "members = 0"
 
         if key:
             return key.fetch1(dj.key)
diff --git a/setup.py b/setup.py
index 0665ceb..adb517c 100644
--- a/setup.py
+++ b/setup.py
@@ -4,10 +4,8 @@
 
 setup(
     name="djutils",
-    version="0.0.1",
+    version="0.1.0",
     description="Datajoint Utilities",
     packages=find_packages(),
-    install_requires=[
-        "datajoint>=0.12.9,<0.13.0"
-    ],
+    install_requires=["datajoint>=0.12.9,<0.13.0"],
 )