diff -urN nmap-7.12/timing.cc nmap-7.12-r1/timing.cc
--- nmap-7.12/timing.cc	2015-06-23 02:09:01.000000000 +0200
+++ nmap-7.12-r1/timing.cc	2016-06-06 16:31:13.610258583 +0200
@@ -707,13 +707,20 @@
   /* Get the estimated time of day at completion */
   timet = last_est.tv_sec;
   ltime = localtime(&timet);
-  assert(ltime);
 
-  log_write(LOG_STDOUT, "%s Timing: About %.2f%% done; ETC: %02d:%02d (%.f:%02.f:%02.f remaining)\n",
-      scantypestr, perc_done * 100, ltime->tm_hour, ltime->tm_min,
-      floor(time_left_s / 60.0 / 60.0),
-      floor(fmod(time_left_s / 60.0, 60.0)),
-      floor(fmod(time_left_s, 60.0)));
+  if (ltime != NULL) {
+    log_write(LOG_STDOUT, "%s Timing: About %.2f%% done; ETC: %02d:%02d (%.f:%02.f:%02.f remaining)\n",
+        scantypestr, perc_done * 100, ltime->tm_hour, ltime->tm_min,
+        floor(time_left_s / 60.0 / 60.0),
+        floor(fmod(time_left_s / 60.0, 60.0)),
+        floor(fmod(time_left_s, 60.0)));
+  } else {
+    log_write(LOG_STDOUT, "%s Timing: About %.2f%% done; ETC: Unknown (%.f:%02.f:%02.f remaining)\n",
+        scantypestr, perc_done * 100, 
+        floor(time_left_s / 60.0 / 60.0),
+        floor(fmod(time_left_s / 60.0, 60.0)),
+        floor(fmod(time_left_s, 60.0)));
+  }
   xml_open_start_tag("taskprogress");
   xml_attribute("task", "%s", scantypestr);
   xml_attribute("time", "%lu", (unsigned long) now->tv_sec);