From 54b86e303ba6a8188fc5f731a79ca609aa58d565 Mon Sep 17 00:00:00 2001
From: Gregory John Casamento <greg.casamento@gmail.com>
Date: Sun, 4 Aug 2019 23:26:41 -0400
Subject: [PATCH] Fix issue with earlier versions of clang

---
 Source/NSOperation.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Source/NSOperation.m b/Source/NSOperation.m
index 5b9ce899e..c8dcbfafd 100644
--- a/Source/NSOperation.m
+++ b/Source/NSOperation.m
@@ -579,7 +579,7 @@ static NSArray	*empty = nil;
 {
   NSEnumerator *en = [[self executionBlocks] objectEnumerator];
   GSBlockOperationBlock theBlock;
-  while((theBlock = [en nextObject]) != nil)
+  while((theBlock = [en nextObject]) != NULL)
     {
       CALL_BLOCK_NO_ARGS(theBlock);
     }