segmentation fault?

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

    @autoreleasepool {

    NSMutableArray *array1 =[[NSMutableArray alloc]initWithObjects:@"1","2","3",nil];

    [array1 addObject:@"4"];

    [array1 insertObject:@"5" atIndex:2];

    NSLog(@"%@",array1);

    }

    return 0;

}