From 57c3d558f33fe8bbb7a87423f5a37784337b79b5 Mon Sep 17 00:00:00 2001
From: Michael Starke <michael.starke@hicknhack-software.com>
Date: Mon, 4 Jan 2021 19:40:08 +0100
Subject: [PATCH] Better run-time checks for QRCode scanning

---
 MacPass/NSImage+MPQRCode.m | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/MacPass/NSImage+MPQRCode.m b/MacPass/NSImage+MPQRCode.m
index 73bfdc21..9ac3db32 100644
--- a/MacPass/NSImage+MPQRCode.m
+++ b/MacPass/NSImage+MPQRCode.m
@@ -13,7 +13,11 @@
 
 - (NSString *)QRCodeString {
   NSRect rect = NSMakeRect(0, 0, self.size.width, self.size.height);
-  NSBitmapImageRep *bitmapRep = (NSBitmapImageRep *)[self bestRepresentationForRect:rect context:nil hints:nil];
+  id imageRep = [self bestRepresentationForRect:rect context:nil hints:nil];
+  if([imageRep isKindOfClass:NSBitmapImageRep.class]) {
+    return @"";
+  }
+  NSBitmapImageRep *bitmapRep = (NSBitmapImageRep *)imageRep;
   CIImage *ciImage = [[CIImage alloc] initWithBitmapImageRep:bitmapRep];
   CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:nil];
   NSArray<CIFeature *> *features = [detector featuresInImage:ciImage];