diff --git a/che_close/func.php b/che_close/func.php
index 985291f..62daa1c 100644
--- a/che_close/func.php
+++ b/che_close/func.php
@@ -6726,8 +6726,9 @@ function disaster($connect) {
         else { $ratio = 6 - round(1.0*$city[secu]/$city[secu2]*3); }    // 3 ~ 6%
 
         if(rand()%100+1 < $ratio) {
-            $disastercity[count($disastercity)] = $city[city];
-            $disasterratio[count($disastercity)] = 1.0 * $city[secu] / $city[secu2];
+            $idx = count($disastercity);
+            $disastercity[$idx] = $city[city];
+            $disasterratio[$idx] = 1.0 * $city[secu] / $city[secu2];
             $disastername .= $city[name]." ";
         }
     }