diff --git a/ExpCore/GuiParts/center.lua b/ExpCore/GuiParts/center.lua
index 8036d536..3b13fa19 100644
--- a/ExpCore/GuiParts/center.lua
+++ b/ExpCore/GuiParts/center.lua
@@ -50,7 +50,7 @@ function center._center.open(event)
         direction='vertical',
         style=mod_gui.frame_style
     }
-    if player.gui.is_valid_sprite_path(center_frame.caption) then center_frame.caption = '' end
+    if is_type(center_frame.caption,'string') and player.gui.is_valid_sprite_path(center_frame.caption) then center_frame.caption = '' end
     if is_type(_center.draw,'function') then
         local success, err = pcall(_center.draw,_center,center_frame)
         if not success then error(err) end