NSMutableAttributedString initWithData: causing EXC_BAD_ACCESS on rotation

I display different types of contents in a tableview and calculate the height of each cell using different custom methods, in heightForRowAtIndexPath.

One of these custom methods implies converting some html in an NSMutableAttributedString, and then calculating the height of this NSMutableAttributedString.
For html conversion I use the new initWithData: method.

All works perfectly except when I rotate the screen => I've got an exc_bad_access every time.

Using Instruments / Zombies, I've been able lo locate the error, and in fact it's this initWithData:.

(When I remove this method and create a "simple" NSMutableAttributedString with initWithString, I can change orientation as many time as I want, no crash anymore).

Any idea why?

(By the way, my project use ARC)

Instrument / Zombie screenshot :

Custom method called in heightForRowAtIndexPath :

< UtilitiesForFrontEndUI heightForFacebookAttributedText: >

+(CGFloat)heightForFacebookAttributedText:(NSString *)attributedText withWidth:(CGFloat)width
{
    NSAttributedString *formatedText = [self formatRawFacebookContentForFrontEndRichTextContents:attributedText];
    CGRect rect= [formatedText boundingRectWithSize:CGSizeMake(width, 1000) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil];
    return ceilf(rect.size.height);
}

Custom method using the initWithData for html to NSMutableAttributedString conversion :

< UtilitiesForFrontEndUI formatRawFacebookContentForFrontEndRichTextContents: >

+(NSAttributedString *)formatRawFacebookContentForFrontEndRichTextContents:(NSString *)stringToFormat
{
    // THIS GENERATE EXC_BAD_ACCESS ON DEVICE ROTATION (WORKS IF NO ROTATION)
    NSData *dataContent = [stringToFormat dataUsingEncoding:NSUTF8StringEncoding];
    NSMutableAttributedString *richTxtContent = [[NSMutableAttributedString alloc] initWithData:dataContent options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,NSCharacterEncodingDocumentAttribute: [NSNumber numberWithInt:NSUTF8StringEncoding]} documentAttributes:nil error:nil];

    NSRange myRange;
    myRange.location = 0;
    myRange.length = richTxtContent.length;

    [richTxtContent addAttributes:[self commonAttributesForFrontEndRichText] range:myRange];

    return richTxtContent;
}

If I replace initWithData by a simple initWithString no more exc_bad_access

+(NSAttributedString *)formatRawFacebookContentForFrontEndRichTextContents:(NSString *)stringToFormat
{   
    // THIS WORKS (NO MORE ROTATION CRASH)
    NSMutableAttributedString *richTxtContent = [[NSMutableAttributedString alloc]initWithString:stringToFormat];

    NSRange myRange;
    myRange.location = 0;
    myRange.length = richTxtContent.length;

    [richTxtContent addAttributes:[self commonAttributesForFrontEndRichText] range:myRange];

    return richTxtContent;
}