dlopen returns NULL after app kill

Question

I'm using dlsym to load private APIs (required on iOS 9.3) :

handle = dlopen(CORETELPATH, RTLD_LAZY);
_CTServerConnectionCreate = dlsym(handle, "_CTServerConnectionCreate");

When I kill the app (swipe from bottom on multitask mode) and restart app, it crashes on the second line.

The handle is equal to NULL and I didn't succeed in loading the lib twice.

I tried to get the error with dlerror(), but it returns also NULL.

Does anybody got this issue ? How to resolve it ?

Edit : Here is the full code ; with the if (handle != NULL) the app doesn't crashes, but private frameworks won't load also

#define CORETELPATH "/System/Library/PrivateFrameworks/CoreTelephony.framework/CoreTelephony"

handle = dlopen(CORETELPATH, RTLD_LAZY);
            NSLog(@"DL Error : %s", dlerror());
            if (handle != NULL) {
                _CTServerConnectionCreate = dlsym(handle, "_CTServerConnectionCreate");
                CTResultConnection = _CTServerConnectionCreate(NULL, simMonitorCallback, NULL);
                _CTServerConnectionAddToRunLoop = dlsym(handle, "_CTServerConnectionAddToRunLoop");
                _CTServerConnectionAddToRunLoop(CTResultConnection, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
                _CTServerConnectionRegisterForNotification = dlsym(handle, "_CTServerConnectionRegisterForNotification");
                _CTServerConnectionUnregisterForNotification = dlsym(handle, "_CTServerConnectionUnregisterForNotification");
                _CTServerConnectionRegisterForNotification(CTResultConnection, kCTSIMSupportSIMStatusChangeNotification);
                _CTServerConnectionGetSIMStatus = dlsym(handle, "_CTServerConnectionGetSIMStatus");
                _CTServerConnectionCopyMobileEquipmentInfo = dlsym(handle, "_CTServerConnectionCopyMobileEquipmentInfo");
            }

Answer 1

It seems that changing Private API path to public fix the issue ; and the call to private APIs still works :

#define CORETELPATH "/System/Library/Frameworks/CoreTelephony.framework/CoreTelephony"