handle zero division

app/Http/Controllers/ActivityController.php

@@ -431,10 +431,10 @@ class ActivityController extends Controller
                 $duration = MasterFunctionsHelper::countDays($ganttId, $plannedStart, $plannedEnd);
                 if ($today >= $endDate) {
                     $endDate = $today;
-                    $rerataBobot = $activity->bobot_planning / $duration;
+                    $rerataBobot = $duration > 0 ? $activity->bobot_planning / $duration : 0;
                     $bobotActual = $activity->progress * $activity->bobot_planning;
                     $sisaBobot = $activity->bobot_planning - $bobotActual;
-                    $sisaHari = $sisaBobot / $rerataBobot;
+                    $sisaHari = $rerataBobot > 0 ? $sisaBobot / $rerataBobot : 0;
                     $endDate->modify("+".$sisaHari." Days");
                     $actualDuration = MasterFunctionsHelper::countDays($ganttId, $startDate, $endDate);
                     $activity->duration = $actualDuration;