Merge pull request nxtbgthng#62 from gabrielrinaldi/13ee0fb6991ebfbbf9e2bbe0c34ebbe391bb6980

Fixed crash on token JSON

Author: toto

README.md

@@ -31,6 +31,7 @@ Getting the sources is as easy as doing a:
     * Add `$(SRCROOT)/path/to/OAuth2Client` _Header Search Paths_, set as _recursive_
     * Add `-ObjC` to _Other Linker Flags_
 * `#import "NXOAuth2.h"`
+* add the Security.framework as a build dependency
 
 #### Desktop Mac projects
 

Sources/OAuth2Client/NXOAuth2AccessToken.m

@@ -67,7 +67,7 @@ + (id)tokenWithResponseBody:(NSString *)theResponseBody tokenType:(NSString *)to
     }
 
     NSDate *expiryDate = nil;
-    if (expiresIn) {
+    if (expiresIn != nil && expiresIn != [NSNull null]) {
         expiryDate = [NSDate dateWithTimeIntervalSinceNow:[expiresIn integerValue]];
     }
     return [[[self class] alloc] initWithAccessToken:anAccessToken