diff --git a/Source/Engine/UI/GUI/Common/TextBoxBase.cs b/Source/Engine/UI/GUI/Common/TextBoxBase.cs
index 05183d57a..c08b59f48 100644
--- a/Source/Engine/UI/GUI/Common/TextBoxBase.cs
+++ b/Source/Engine/UI/GUI/Common/TextBoxBase.cs
@@ -769,13 +769,13 @@ namespace FlaxEngine.GUI
             {
                 SetSelection(SelectionLeft);
             }
-            else if (SelectionLeft > 0)
+            else if (SelectionLeft >= 0)
             {
                 int position;
                 if (ctrl)
                     position = FindPrevWordBegin();
                 else
-                    position = _selectionEnd - 1;
+                    position = Mathf.Max(_selectionEnd - 1, 0);
 
                 if (shift)
                 {