diff --git a/src/canvas.py b/src/canvas.py
index f20cd1a..983bfdc 100644
--- a/src/canvas.py
+++ b/src/canvas.py
@@ -317,6 +317,9 @@ def vertical_line(self, x, start_y, length, char, draw):
     def set_char_at(self, x, y, char, draw):
         _layer = self.drawing if draw else self.preview
 
+        if char == "":
+            char = " "
+
         if y >= len(_layer) or x >= len(_layer[0]) or x < 0 or y < 0:
             return
         if draw:
diff --git a/src/tools/line.py b/src/tools/line.py
index d65d285..4f3f969 100644
--- a/src/tools/line.py
+++ b/src/tools/line.py
@@ -40,6 +40,7 @@ def __init__(self, *args, **kwargs):
         builder = Gtk.Builder.new_from_resource("/io/github/nokse22/asciidraw/ui/line_sidebar.ui")
         self._sidebar = builder.get_object("line_stack_page")
         self.line_type_combo  = builder.get_object("line_type_combo")
+        self.arrow_switch  = builder.get_object("line_arrow_switch")
 
         self.start_x = 0
         self.start_y = 0
@@ -61,15 +62,7 @@ def __init__(self, *args, **kwargs):
         self.prev_pos = [0,0]
 
         self.line_type_combo.bind_property("selected", self, "line_type")
-
-    @GObject.Property(type=bool, default=False)
-    def active(self):
-        return self._active
-
-    @active.setter
-    def active(self, value):
-        self._active = value
-        self.notify('active')
+        self.arrow_switch.bind_property("active", self, "arrow")
 
     @GObject.Property(type=bool, default=False)
     def arrow(self):
diff --git a/src/window.py b/src/window.py
index c08087e..3fd08e1 100644
--- a/src/window.py
+++ b/src/window.py
@@ -409,8 +409,11 @@ def make_new_canvas(self):
         self.file_path = ""
         self.title_widget.set_subtitle("")
         self.canvas.undo_changes = []
+        self.canvas.redo_changes = []
         self.undo_button.set_sensitive(False)
         self.undo_button.set_tooltip_text("")
+        self.redo_button.set_sensitive(False)
+        self.redo_button.set_tooltip_text("")
         self.canvas.is_saved = True
         toast = Adw.Toast(title=_("New Canvas"), timeout=2)
         self.toast_overlay.add_toast(toast)