Error in webpage because i supplied an invalid argument

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My webpage (www.designyourspace.co) has started showing error when I entered an invalid argument in the the link option. The webpage is of wordpress and source code of its front page is apparently not editable directly. (So, I cannot remove the invalid argument, I guess).

/*Check if Repeater is empty*/
function parallax_one_general_repeater_is_empty($parallax_one_arr){
	$parallax_one_services_decoded = json_decode($parallax_one_arr);
	foreach($parallax_one_services_decoded as $parallax_box){
		if(!empty($parallax_box->choice) && $parallax_box->choice == 'parallax_none'){
			$parallax_box->icon_value = '';
			$parallax_box->image_url = '';
		}
		foreach ($parallax_box as $key => $value){
			if(!empty($value) && $key!='choice' && $key!='id' && ($value!='No Icon' && $key=='icon_value') ) {
				return false;
			}
		}
	}
	return true;
}

This is the part of code of webpage which shows error.

Please tell me if I have to be more descriptive.

What I have tried:

Also posted the same ques here but no one helped! :(
http://stackoverflow.com/questions/35817991/unable-yo-customize-wordpress-page-because-i-supplied-an-invalid-argument-somewh?lq=1