Index: exec.c
==================================================================
--- exec.c
+++ exec.c
@@ -1821,15 +1821,15 @@
       c|=b&classes[objects[n]->class]->collisionLayers;
       b|=classes[objects[n]->class]->collisionLayers;
       n=objects[n]->up;
     }
     if(c) return c;
-    n=playfield[x.u+y.u*64-65];
-    while(n!=VOIDLINK) objects[n]->oflags|=OF_BIZARRO,n=objects[n]->up;
+    m=n=playfield[x.u+y.u*64-65];
+    while(m!=VOIDLINK) objects[m]->oflags|=OF_BIZARRO,m=objects[m]->up;
     m=playfield[x.u+y.u*64-65]=bizplayfield[x.u+y.u*64-65];
     bizplayfield[x.u+y.u*64-65]=n;
-    while(m!=VOIDLINK) objects[n]->oflags&=~OF_BIZARRO,m=objects[m]->up;
+    while(m!=VOIDLINK) objects[m]->oflags&=~OF_BIZARRO,m=objects[m]->up;
     return 0;
   } else {
     m=v_object(x);
     n=v_object(y);
     if(m==VOIDLINK || n==VOIDLINK || m==n) return 0x100;