Update EditorRenderer.cs (#15466)

Author: jfversluis

Xamarin.Forms.Platform.Android/Renderers/EditorRenderer.cs

@@ -265,14 +265,17 @@ void UpdateCharacterSpacing()
 
 		void UpdateText()
 		{
+			if (EditText == null || Element == null)
+				return;
+
 			string newText = Element.UpdateFormsText(Element.Text, Element.TextTransform);
 
 			if (EditText.Text == newText)
 				return;
 
 			newText = TrimToMaxLength(newText);
 			EditText.Text = newText;
-			EditText.SetSelection(newText.Length);
+			EditText.SetSelection(EditText.Text.Length);
 		}
 
 		abstract protected void UpdateTextColor();