diff --git a/secure/potionmaster.c b/secure/potionmaster.c
index 78a0565..eb39dbe 100644
--- a/secure/potionmaster.c
+++ b/secure/potionmaster.c
@@ -87,6 +87,7 @@
 private void RebuildCache() {
   // Cache invalidieren; vor-initialisiert zur Beschleunigung des Rebuilds.
   lists = ([0:({}),1:({}),2:({}),3:({}),4:({}),5:({}),6:({}),7:({})]);
+  reverse_table = ([]);
   foreach (int num, string room, int list : potions) {
     reverse_table += ([room:num]);
     lists[list] += ({num});