New posts getting error of "Trying to get property of non-object"

Getting PHP warning when adding a new post. Trying to get property of non-object in… Undefined index: projLink and also tools.

What do I need to fix in my code? I know Its telling me projLink and tools is not set. Thanks.

function portfolio_meta_options(){
global $post;
	if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) return $post_id;
		$custom = get_post_custom($post->ID);
		$link = $custom["projLink"][0];
		$tools = $custom["tools"][0];
 		?>
		<label>Link:</label><input name="projLink" value="<?php echo $link; ?>" /><br />
		<label>Tools:</label><input name="tools" value="<?php echo $tools; ?>" />
		<?php
    }

add_action('save_post', 'save_project_link');

function save_project_link(){
	global $post; 

		if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ){
		return $post_id;
			}else{
		update_post_meta($post->ID, "projLink", $_POST["projLink"]);
		update_post_meta($post->ID, "tools", $_POST["tools"]);
	}
}

add_filter("manage_edit-portfolio_columns", "project_edit_columns");  ?>