Index: nse_main.cc
===================================================================
--- nse_main.cc	(revision 10802)
+++ nse_main.cc	(working copy)
@@ -462,6 +462,21 @@
 				SCRIPT_ENGINE_DEBUGGING(
 					const char* errmsg = lua_tostring(current.thread, -1);
 					log_write(LOG_STDOUT, "%s: %s\n", SCRIPT_ENGINE, errmsg);
+                    lua_getglobal(L, "debug");
+                    if (lua_istable(L, -1))
+                    {
+                      lua_getfield(L, -1, "traceback");
+                      lua_pushthread(current.thread);
+                      lua_xmove(current.thread, L, 1);
+                      if (lua_pcall(L, 1, 1, 0) == 0)
+                      {
+                        const char *traceback = lua_tostring(L, -1);
+					    log_write(LOG_STDOUT, "%s: %s\n",
+                            SCRIPT_ENGINE, traceback);
+                      }
+                      lua_pop(L, 1); // pcall return
+                    }
+                    lua_pop(L, 1); // Pop whatever was "debug"
 				)
 				SCRIPT_ENGINE_TRY(process_finalize(L, current.registry_idx));
 			}