diff --git a/document/document.go b/document/document.go
index fcbd64b..0fa4b86 100644
--- a/document/document.go
+++ b/document/document.go
@@ -175,6 +175,9 @@ func (d *Document) SaveToFile(path string) (f *os.File, err error) {
 
 func DeleteDocuments(docs []*Document) error {
 	for _, d := range docs {
+		if d == nil {
+			continue
+		}
 		if err := d.DeleteFile(); err != nil {
 			return err
 		}
diff --git a/quicksort.go b/quicksort.go
index f1f2964..70fade7 100644
--- a/quicksort.go
+++ b/quicksort.go
@@ -50,3 +50,13 @@ func partition(que QuickSortable, low, high int, dir QSortDirection) int {
 	que.Swap(i+1, high)
 	return i + 1
 }
+
+func BubbleSort(arr []int64) {
+	for i := 0; i < len(arr)-1; i++ {
+		for j := i; j < len(arr); j++ {
+			if arr[i] > arr[j] {
+				arr[i], arr[j] = arr[j], arr[i]
+			}
+		}
+	}
+}
diff --git a/server.go b/server.go
index 27ad8ea..1531a6a 100644
--- a/server.go
+++ b/server.go
@@ -4,7 +4,6 @@ import (
 	"database/sql"
 	"fmt"
 	"net/http"
-	"time"
 
 	"git.to-net.rs/marko.tikvic/gologger"
 	"github.com/gorilla/mux"
@@ -38,7 +37,7 @@ func NewODBCServer(dsn, port, logDir string) (s *Server, err error) {
 	s.DBs["default"] = s.DB
 
 	s.dsn = make(map[string]string)
-	s.DBs["default"] = s.DB
+	s.dsn["default"] = dsn
 
 	return s, nil
 }
@@ -79,18 +78,3 @@ func CommitChanges(tx *sql.Tx, err *error, opt ...error) {
 		tx.Rollback()
 	}
 }
-
-func (s *Server) RefreshDatabaseConnections(period time.Duration) {
-	for {
-		for k, db := range s.DBs {
-			if err := db.Ping(); err != nil {
-				if s.Logger != nil {
-					s.Logger.PrintAndTrace("failed to ping database (%s): %s", s.dsn[k], err.Error())
-				} else {
-					fmt.Println("failed to ping database (%s): %s", s.dsn[k], err.Error())
-				}
-			}
-		}
-		time.Sleep(period)
-	}
-}