crash in xcode10 and ios12

[CJCX]

crash in xcode10 and ios12

[nicklockwood]

@CJCX I'm going to need some more information. Do you have a crash log? How can I reproduce the issue.

[DemonH21]

some iphone6(plus) ios12.0 crash
log:Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSMethodSignature signatureWithObjCTypes:]: type signature is empty.'

[FindCrt]

I encountered the same crash . It crash on signature = [someClass instanceMethodSignatureForSelector:selector]; when the selector is bytes and the someClass is _PFPlaceholderMulticaster. The crash log is same as DemonH21.

[liuxuan30]

met this issue as well. Logs from crashlytics:

Fatal Exception: NSInvalidArgumentException+[NSMethodSignature signatureWithObjCTypes:]: type signature is empty. Raw Text
--
0 | CoreFoundation | __exceptionPreprocess
2 | CoreFoundation | +[NSMethodSignature signatureWithObjCTypes:]
3 | BrandApp | NSNull+Convertor.m line 114-[NSNull(NullSafe) methodSignatureForSelector:]
4 | CoreFoundation | ___forwarding___
5 | CoreFoundation | _CF_forwarding_prep_0
6 | BrandedApp | RatingsModel.m line 76-[AAProductRatingsUnit initWithJSONDict:]

in my case, the json returns null, and my NSDictionary is NSNull object, then when trying to call [json[@"average"]floatValue]; inside RatingsModel.m line 76-[AAProductRatingsUnit initWithJSONDict:] it triggers the above crash trace log.

However, it's not crashing everytime. This log is from an iPhone 8 Plus iOS 12.0.1, however, when I use an iPhone X 10.0.1 to try to reproduce, it's not crashing at all.

[hongliang90]

fix ?

[nicklockwood]

I wasn't able to reproduce the issue, but I've pushed a new release that should hopefully fix it. Let me know if not.

[liuxuan30]

which commit you refer as the fix for this?

[nicklockwood]

@liuxuan30 34637b5

[shevakuilin]

I had a similar problem

NSInvalidArgumentException
+[NSMethodSignature signatureWithObjCTypes:]: type signature is empty.

0 CoreFoundation | ___exceptionPreprocess + 228
1 libobjc.A.dylib | objc_exception_throw + 56
2 CoreFoundation | +[NSMethodSignature signatureWithObjCTypes:] + 1244
3 JJBasicService | -[NSNull(NullSafe) methodSignatureForSelector:] + 940