diff --git a/pkg/common/cartesian.go b/pkg/common/cartesian.go
index a4485a0..9cd6065 100644
--- a/pkg/common/cartesian.go
+++ b/pkg/common/cartesian.go
@@ -27,7 +27,7 @@ func cartN(a ...[]interface{}) [][]interface{} {
 	for _, a := range a {
 		c *= len(a)
 	}
-	if c == 0 {
+	if c == 0 || len(a) == 0 {
 		return nil
 	}
 	p := make([][]interface{}, c)
diff --git a/pkg/common/cartesian_test.go b/pkg/common/cartesian_test.go
index 0d9332d..69a6e4e 100644
--- a/pkg/common/cartesian_test.go
+++ b/pkg/common/cartesian_test.go
@@ -25,4 +25,16 @@ func TestCartesianProduct(t *testing.T) {
 		assert.Contains(v, "baz")
 	}
 
+  input = map[string][]interface{}{
+		"foo": {1, 2, 3, 4},
+		"bar": {},
+		"baz": {false, true},
+  }
+  output = CartesianProduct(input)
+  assert.Len(output, 0)
+
+  input = map[string][]interface{}{}
+  output = CartesianProduct(input)
+  assert.Len(output, 0)
 }
+