diff --git a/src/ai.c b/src/ai.c
index 68094d3..885a16c 100644
--- a/src/ai.c
+++ b/src/ai.c
@@ -619,7 +619,6 @@ static int ai_cargofree(lua_State* L) {
 static int ai_exists(lua_State* L) {
   Pilot* p;
   int i;
-  LLUA_MIN_ARGS(1);
 
   if(lua_isnumber(L,1)) {
     i = 1;
@@ -629,7 +628,10 @@ static int ai_exists(lua_State* L) {
     lua_pushboolean(L, i);
     return 1;
   }
-  LLUA_INVALID_PARAMETER();
+
+  /* Default to false for everything that isn't a pilot. */
+  lua_pushboolean(L, 0);
+  return 0;
 }
 
 /* Are we at max velocity? */