bail out of make_sign_texture is the node is unknown

diff --git a/api.lua b/api.lua
index 39734dfe73f97e57aa75de1fed2f9c1c456247a5..4c879afc5249fdb9c88d73c863f8f29df0bfb44f 100644 (file)
--- a/api.lua
+++ b/api.lua
@@ -419,6 +419,7 @@ end
 local function make_sign_texture(lines, pos)
        local node = minetest.get_node(pos)
        local def = minetest.registered_items[node.name]
+       if not def then return end
 
        local font_size
        local line_width