From ade53925a616059f43b8d3f1dfcd0639e2e71132 Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Tue, 22 Mar 2022 11:06:28 +0200
Subject: [PATCH] Lua: error when supplied coordinate is not table

---
 src/sp_lev.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/sp_lev.c b/src/sp_lev.c
index e1193e045..18e51d7b3 100644
--- a/src/sp_lev.c
+++ b/src/sp_lev.c
@@ -5371,8 +5371,9 @@ boolean
 get_coord(lua_State *L, int i, lua_Integer *x, lua_Integer *y)
 {
     boolean ret = FALSE;
+    int ltyp = lua_type(L, i);
 
-    if (lua_type(L, i) == LUA_TTABLE) {
+    if (ltyp == LUA_TTABLE) {
         int arrlen;
         boolean gotx = FALSE;
 
@@ -5407,6 +5408,9 @@ get_coord(lua_State *L, int i, lua_Integer *x, lua_Integer *y)
 
             return TRUE;
         }
+    } else if (ltyp != LUA_TNIL) {
+        /* non-existent coord is ok */
+        nhl_error(L, "non-table coord specified");
     }
     return ret;
 }