diff --git a/src/act.wizard.c b/src/act.wizard.c
index 9dd1037..19535a1 100644
--- a/src/act.wizard.c
+++ b/src/act.wizard.c
@@ -1960,7 +1960,7 @@ static void perform_immort_invis(struct char_data *ch, int level)
   struct char_data *tch;
 
   for (tch = world[IN_ROOM(ch)].people; tch; tch = tch->next_in_room) {
-    if (tch == ch)
+    if (tch == ch || IS_NPC(tch))
       continue;
     if (GET_ADMLEVEL(tch) >= GET_INVIS_LEV(ch) && GET_ADMLEVEL(tch) < level)
       act("You blink and suddenly realize that $n is gone.", FALSE, ch, 0,
diff --git a/src/ibt.c b/src/ibt.c
index ed8c8ff..b520fb3 100755
--- a/src/ibt.c
+++ b/src/ibt.c
@@ -1074,7 +1074,7 @@ void ibtedit_parse(struct descriptor_data *d, char *arg)
     case IBTEDIT_FLAGS:
       if ((i = atoi(arg)) <= 0)
         break;
-      else if (i <= NUM_MOB_FLAGS)
+      else if (i <= NUM_IBT_FLAGS)
         TOGGLE_BIT_AR(IBT_FLAGS(OLC_IBT(d)), (i - 1));
       ibtedit_disp_flags(d);
       return;
diff --git a/src/magic.c b/src/magic.c
index b67c110..4f863ea 100644
--- a/src/magic.c
+++ b/src/magic.c
@@ -912,7 +912,7 @@ void mag_alter_objs(int level, struct char_data *ch, struct obj_data *obj,
       }
       break;
     case SPELL_INVISIBLE:
-      if (!OBJ_FLAGGED(obj, ITEM_NOINVIS) || !OBJ_FLAGGED(obj, ITEM_INVISIBLE)) {
+      if (!OBJ_FLAGGED(obj, ITEM_NOINVIS) && !OBJ_FLAGGED(obj, ITEM_INVISIBLE)) {
         SET_BIT_AR(GET_OBJ_EXTRA(obj), ITEM_INVISIBLE);
         to_char = "$p vanishes.";
       }