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// in the muffin-options/fields/select/field_select.php file please find:
foreach($this->field['options'] as $k => $v){
	echo '<option value="'.$k.'" '.selected($this->value, $k, false).'>'.$v.'</option>';
}

// and replace it with:
if( is_array($this->field['options']) ){
	foreach($this->field['options'] as $k => $v){
		echo '<option value="'.$k.'" '.selected($this->value, $k, false).'>'.$v.'</option>';
	}	
}