App Crashes in iOS 8 working in iOS 7 - ios

Question

If I Push the View with Animation set to YES , the app crashes and below is the stack trace. and if I push to view without animation it is working correctly.
-[NewsFeedDetailView viewWillAppear:]
Nov 26 17:58:48 <Error>: -[NSNull length]: unrecognized selector sent to instance 0x307c1400
Nov 26 17:58:48 <Warning>: Stack Trace:: (
0 CoreFoundation 0x225f8d7f <redacted> + 150
1 libobjc.A.dylib 0x2fe57c77 objc_exception_throw + 38
2 CoreFoundation 0x225fe22d <redacted> + 0
3 CoreFoundation 0x225fc109 <redacted> + 712
4 CoreFoundation 0x2252d938 _CF_forwarding_prep_0 + 24
5 UIKit 0x25aa7a9b <redacted> + 38
6 UIKit 0x25b16d5b <redacted> + 66
7 UIKit 0x25b16d11 <redacted> + 84
8 UIKit 0x25b16c99 <redacted> + 400
9 QuartzCore 0x254f4681 <redacted> + 228
10 QuartzCore 0x254de0c1 <redacted> + 2068
11 QuartzCore 0x255bfb4d <redacted> + 52
12 QuartzCore 0x254dd8a5 <redacted> + 88
13 QuartzCore 0x254dd555 <redacted> + 1156
14 QuartzCore 0x254c1b1d <redacted> + 200
15 QuartzCore 0x254c17e1 <redacted> + 24
16 QuartzCore 0x254c11c7 <redacted> + 222
17 QuartzCore 0x254c0fd1 <redacted> + 324
18 UIKit 0x25a9c5f9 <redacted> + 1384
19 CoreFoundation 0x225bf5e7 <redacted> + 14
20 CoreFoundation 0x225be9fb <redacted> + 222
21 CoreFoundation 0x225bd079 <redacted> + 768
22 CoreFoundation 0x2250a981 CFRunLoopRunSpecific + 476
23 CoreFoundation 0x2250a793 CFRunLoopRunInMode + 106
24 GraphicsServices 0x298e3051 GSEventRunModal + 136
25 UIKit 0x25afc981 UIApplicationMain + 1440
26 W I T Party 0x0014b1fd main + 220
27 libdyld.dylib 0x303f3aaf <redacted> + 2
)
Please help me out with this
This is my viewWillAppear. I am just calling the super.
-(void)viewWillAppear:(BOOL)animated {
NSLog(#"%s",__func__);
[super viewWillAppear:NO];
}