1 files changed, 3 insertions, 0 deletions
diff --git a/src/curses.c b/src/curses.c
index 9fcfa09..34809f9 100644
--- a/src/curses.c
+++ b/src/curses.c
@@ -125,6 +125,9 @@ static int get_char_attr(lua_State* L, int stack_pos)
                 int cur_mode;
 
                 cur_mode = get_mode_enum(str);
+                if (cur_mode == -1) {
+                    return luaL_error(L, "Unknown attribute %s", str);
+                }
 
                 lua_toboolean(L, -1) ? (mode |= cur_mode) : (mode &= ~cur_mode);
             }