diff --git a/src/ai.c b/src/ai.c
index 3ec9f23..b157de3 100644
--- a/src/ai.c
+++ b/src/ai.c
@@ -1025,6 +1025,7 @@ static int ai_face(lua_State* L) {
       vect_cset(&tv, VX(p->solid->pos), VY(p->solid->pos));
       lv = NULL;
     }
+    else LLUA_INVALID_PARAMETER();
   }
   else if(lua_isvector(L, 1))
     lv = lua_tovector(L, 1);
diff --git a/src/map.c b/src/map.c
index ed87c97..6fb3100 100644
--- a/src/map.c
+++ b/src/map.c
@@ -223,9 +223,10 @@ static void map_update(unsigned int wid) {
   }
 
   /* Get planets. */
-  if(sys->nplanets == 0)
-    window_modifyText(wid, "txtPlanets", "None");
-  else {
+  if(sys->nplanets == 0) {
+    strncpy(buf, "None", 128);
+    window_modifyText(wid, "txtPlanets", buf);
+  } else {
     buf[0] = '\0';
     if(sys->nplanets > 0)
       strcat(buf, sys->planets[0]->name);