1 files changed, 2 insertions, 0 deletions

diff --git a/src/llthread.c b/src/llthread.c
index 66efe7c..a3b3216 100644
--- a/src/llthread.c
+++ b/src/llthread.c
@@ -132,6 +132,8 @@ static int fail(lua_State *L, const char *msg){
 void llthread_log(lua_State *L, const char *hdr, const char *msg){
   int top = lua_gettop(L);
   lua_rawgetp(L, LUA_REGISTRYINDEX, LLTHREAD_LOGGER_HOLDER);
+  if (!msg) 
+    msg = "(no error message)";
   if(lua_isnil(L, -1)){
     lua_pop(L, 1);
     fputs(hdr,  stderr);