SIGSEGV在MagicalRecord MR_contextWillSave上崩溃：

Question

我在TestFlight中有一个应用程序，它会在第一次核心数据保存时崩溃。我自己从来没有能够重新创建这个问题，但是多个用户多次发生这种情况。我从我们的服务器获取一组分类作为JSON，然后将结果保存到核心数据，如下所示：

[MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext) {
                                    [self createRestrictions:restrictions inContext:localContext];
                                } completion:^(BOOL success, NSError *error) {
                                    if(success){
                                        dispatch_async(dispatch_get_main_queue(), ^(void) {
                                            DLog(@"got and saved all restrictions");
                                            if(complete){
                                                complete(YES);
                                            }
                                        });
                                    }else{
                                        TFLog(@"error saving restrictions: %@", error);
                                        if(failure){
                                            failure(@"Error saving restrictions");
                                        }
                                    }
                                }];





-(void)createRestrictions:(NSArray *)restrictions
                inContext:(NSManagedObjectContext *)context
{
    for(NSDictionary *_restriction in restrictions){
        Restriction *restriction = [Restriction MR_findFirstByAttribute:@"tid"
                                                              withValue:[NSNumber numberWithInt:[_restriction[@"tid"] intValue]]
                                                              inContext:context];
        if(!restriction){
            restriction = [Restriction MR_createInContext:context];
            restriction.tid = [NSNumber numberWithInt:[_restriction[@"tid"] intValue]];
        }
        ...
    }
}

以下是TestFlight

的崩溃日志的屏幕截图