From d1b7ff8f3c0aa96d484d6067ca06ed46710fc5f4 Mon Sep 17 00:00:00 2001
From: Mattt Thompson <m@mattt.me>
Date: Tue, 18 Jun 2013 20:26:35 -0700
Subject: [PATCH] Return early in AFGetMediaTypeAndSubtypeWithString if string
 is nil

---
 AFNetworking/AFHTTPRequestOperation.m | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/AFNetworking/AFHTTPRequestOperation.m b/AFNetworking/AFHTTPRequestOperation.m
index cb57cdd..be49c21 100644
--- a/AFNetworking/AFHTTPRequestOperation.m
+++ b/AFNetworking/AFHTTPRequestOperation.m
@@ -58,6 +58,10 @@ NSSet * AFContentTypesFromHTTPHeader(NSString *string) {
 }
 
 static void AFGetMediaTypeAndSubtypeWithString(NSString *string, NSString **type, NSString **subtype) {
+    if (!string) {
+        return;
+    }
+
     NSScanner *scanner = [NSScanner scannerWithString:string];
     [scanner setCharactersToBeSkipped:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
     [scanner scanUpToString:@"/" intoString:type];