From 62767971ee9d79f8e90e29caf53521dfc6f0a655 Mon Sep 17 00:00:00 2001
From: Kelvin Sherlock <ksherlock@gmail.com>
Date: Thu, 1 Sep 2022 18:35:33 -0400
Subject: [PATCH] don't crash if a slot is empty (laser3000, which has no slots
 and no disk drives)

---
 Ample/Slot.m | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Ample/Slot.m b/Ample/Slot.m
index 89daef4..a4286ad 100644
--- a/Ample/Slot.m
+++ b/Ample/Slot.m
@@ -131,11 +131,15 @@ static NSDictionary *IndexMap = nil;
 
 -(SlotOption *)selectedItem {
     if (_selectedIndex < 0) return nil;
+    if (_selectedIndex >= [_options count]) return nil;
+
     return [_options objectAtIndex: _selectedIndex];
 }
 
 -(NSArray *)args {
     if (_selectedIndex < 0) return nil;
+    if (_selectedIndex >= [_options count]) return nil;
+
     NSMutableArray *rv = [NSMutableArray new];
     SlotOption *option = [_options objectAtIndex: _selectedIndex];
     
@@ -145,6 +149,8 @@ static NSDictionary *IndexMap = nil;
 
 -(NSDictionary *)serialize {
     if (_selectedIndex < 0) return nil;
+    if (_selectedIndex >= [_options count]) return nil;
+
     
     NSMutableDictionary *d = [NSMutableDictionary new];
     SlotOption *option = [_options objectAtIndex: _selectedIndex];
@@ -209,6 +215,7 @@ static NSDictionary *IndexMap = nil;
 -(Media)selectedMedia {
 
     if (_selectedIndex < 0) return EmptyMedia;
+    if (_selectedIndex >= [_options count]) return EmptyMedia;
 
     Media media = { 0 };
     SlotOption *option = [_options objectAtIndex: _selectedIndex];
@@ -221,6 +228,8 @@ static NSDictionary *IndexMap = nil;
 
 -(NSArray *)selectedChildren {
     if (_selectedIndex < 0) return nil;
+    if (_selectedIndex >= [_options count]) return nil;
+
     return [[_options objectAtIndex: _selectedIndex] children];
 }