diff --git a/models/login_source.go b/models/login_source.go
index 401bbf6714a8..b3142531850b 100644
--- a/models/login_source.go
+++ b/models/login_source.go
@@ -635,7 +635,12 @@ func UserSignIn(username, password string) (*User, error) {
 			}
 		}
 	} else {
-		user = &User{LowerName: strings.ToLower(strings.TrimSpace(username))}
+		trimmedUsername := strings.TrimSpace(username)
+		if len(trimmedUsername) == 0 {
+			return nil, ErrUserNotExist{0, username, 0}
+		}
+
+		user = &User{LowerName: strings.ToLower(trimmedUsername)}
 	}
 
 	hasUser, err := x.Get(user)