1 files changed, 3 insertions, 1 deletions
diff --git a/lauxlib.c b/lauxlib.c
index e6d74168..e3d9be37 100644
--- a/lauxlib.c
+++ b/lauxlib.c
@@ -995,8 +995,10 @@ static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
 
 
 static int panic (lua_State *L) {
+  const char *msg = lua_tostring(L, -1);
+  if (msg == NULL) msg = "error object is not a string";
   lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n",
-                        lua_tostring(L, -1));
+                        msg);
   return 0;  /* return to Lua to abort */
 }