Add condition to Log class to avoid exception if nothing is in the logs table

app/Log.php

@@ -15,6 +15,9 @@ class Log extends Model
     public static function getJobProgression(Wowa $wowa)
     {
         $logs =  self::where('job_id', '=', $wowa->id)->orderBy('generation', 'desc')->first();
+        if (!is_object($logs)) {
+            return "Not begin yet";
+        }
         $generation =  $logs->generation + 1;
         $generation_number = $wowa->generation_number;
         return ($generation / $generation_number) * 100;