NSDictionary EXC_BAD_ACCESS : I have the following code:

    NSString * client_type = @"client_credentials";
    
        @implementation OauthObject
        
        - (NSDictionary*) getParamsCredintion{
    
            return [[NSDictionary alloc] initWithObjectsAndKeys:client_id, @"client_id", client_secret, @"client_secret", client_type, "@client_credentials", nil];
        }

When i try to init NSDictionary with `client_type` key I get error:

`NSDictionary EXC_BAD_ACCESS`
