diff --git a/routes/user/authenticate_endpoint.go b/routes/user/authenticate_endpoint.go
index 0f0ec99..82c2dc9 100644
--- a/routes/user/authenticate_endpoint.go
+++ b/routes/user/authenticate_endpoint.go
@@ -77,13 +77,13 @@ func authenticated(c *gin.Context) {
 			"user":          user.User,
 		})
 	} else {
-		externalAuth, err := configuration.GlobalConfig.Bool("external-auth")
+		authExternal, err := configuration.GlobalConfig.Bool("auth-external")
 		if err != nil {
 			helper.UnauthorizedError(c, "Backend configuration error")
 			return
 		}
 
-		if externalAuth {
+		if authExternal {
 			c.JSON(http.StatusOK, gin.H{
 				"success":       true,
 				"authenticated": false,
@@ -112,18 +112,22 @@ func authenticated(c *gin.Context) {
 func authenticate(c *gin.Context) {
 	var user *User
 
-	externalAuth, err := configuration.GlobalConfig.Bool("auth.external")
+	authExternal, err := configuration.GlobalConfig.Bool("auth.external")
 	if err != nil {
 		helper.UnauthorizedError(c, "Backend configuration error")
 		return
 	}
 
-	if err != nil || !externalAuth {
+	if err != nil || !authExternal {
 		user = authenticateStandard(c)
 	} else {
 		user = authenticateExternal(c)
 	}
 
+	if user == nil {
+		return
+	}
+
 	expiresStr, err := configuration.GlobalConfig.String("jwt.expires-after")
 	if err != nil {
 		helper.UnauthorizedError(c, "Backend configuration error")
diff --git a/routes/user/user_methods.go b/routes/user/user_methods.go
index f1dcd59..885af6d 100644
--- a/routes/user/user_methods.go
+++ b/routes/user/user_methods.go
@@ -42,7 +42,7 @@ func NewUser(username, password, mail, role string, active bool) (*User, error)
 
 	// Check that the username is NOT taken
 	err := newUser.ByUsername(username)
-	if err != nil {
+	if err == nil {
 		return nil, fmt.Errorf("Username is already taken")
 	}