--- items.cc.orig	Wed Aug 14 23:50:16 2002
+++ items.cc	Wed Aug 14 23:46:40 2002
@@ -506,10 +506,11 @@
 {
     class Trigger : public CloneItem<Trigger>, public StaticItem {
     public:
-        Trigger() : Item("it-trigger"), objectcnt(0) {
+        Trigger() : Item("it-trigger"), objectcnt(0), have_stone(false) {
             set_attrib("invisible", 0.0);
         }
     private:
+	bool have_stone;
         int objectcnt;          // The number of objects on the trigger
 
         void on_creation() {set_model();}
@@ -547,10 +548,15 @@
         }
 
         void stone_change(Stone *st) {
-            if (st == 0)
+            if (st == 0 && have_stone){
+		have_stone=false;
                 remove_object();
-            else
+	    }
+            
+	    if (st != 0 && !have_stone){
+		have_stone=true;
                 add_object();
+	    }
         }
     };
 }