diff --git a/main.py b/main.py
index 6415694..98e3ccc 100644
--- a/main.py
+++ b/main.py
@@ -73,11 +73,17 @@ def menu_file_save_project_as_click():
 
 def button_prev_glyph_click():
     global canvas_editor
+    global project
+    if not project.loaded:
+        return
     canvas_editor.prev_glyph()
     update_glyph_preview()
 
 def button_next_glyph_click():
     global canvas_editor
+    global project
+    if not project.loaded:
+        return
     canvas_editor.next_glyph()
     update_glyph_preview()