diff --git a/holder.go b/holder.go
index 22289e4a8..59fef1560 100644
--- a/holder.go
+++ b/holder.go
@@ -96,7 +96,6 @@ func (h *Holder) Open() error {
 
 		index, err := h.newIndex(h.IndexPath(filepath.Base(fi.Name())), filepath.Base(fi.Name()))
 		if err == ErrName {
-
 			h.logger().Printf("ERROR opening index: %s, err=%s", fi.Name(), err)
 			continue
 		} else if err != nil {
diff --git a/index_test.go b/index_test.go
index 1e3df2b35..43a064967 100644
--- a/index_test.go
+++ b/index_test.go
@@ -258,3 +258,32 @@ func TestIndex_CreateInputDefinition(t *testing.T) {
 		t.Fatalf("unexpected input definition actions", inputDef.Fields())
 	}
 }
+
+func TestIndex_CreateExistingInputDefinition(t *testing.T) {
+	index := MustOpenIndex()
+	defer index.Close()
+
+	// Create Input Definition.
+	frames := pilosa.InputFrame{Name: "f", Options: pilosa.FrameOptions{RowLabel: "row"}}
+	action := pilosa.Action{Frame: "f", ValueDestination: "map", ValueMap: map[string]uint64{"Green": 1}}
+	fields := pilosa.Field{Name: "id", PrimaryKey: true, Actions: []pilosa.Action{action}}
+	_ , err := index.CreateInputDefinition("test", []pilosa.InputFrame{frames}, []pilosa.Field{fields})
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = index.CreateInputDefinition("test", []pilosa.InputFrame{frames}, []pilosa.Field{fields})
+	if err != pilosa.ErrInputDefinitionExists {
+		t.Fatal(err)
+	}
+}
+
+func TestIndex_CreateEmptyInputDefinition(t *testing.T) {
+	index := MustOpenIndex()
+	defer index.Close()
+
+	// Create Input Definition.
+	_ , err := index.CreateInputDefinition("test", []pilosa.InputFrame{}, []pilosa.Field{})
+	if err.Error() != "frames and fields are required" {
+		t.Fatal(err)
+	}
+}