NSJSONSerialization returns EXC_BAD_ACCESS - objective-c

Question

I am parsing a JSON file created by a PHP-Script using NSJSONSerialization.
When I clear the code (Product - clear) it works perfectly. But when I stop the program and build it again without Product - clear, it will crash at this line with EXC_BAD_ACCESS.
I use ARC.
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:adresse]];
NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSError *jsonParsingError = nil;
if (response == nil) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error" message:#"Connection" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
}
else {
if (![NSJSONSerialization JSONObjectWithData:response options:0 error:&jsonParsingError]) {
UIAlertView *jsonAlert = [[UIAlertView alloc] initWithTitle:#"Error" message:#"JSON Parsingerror" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[jsonAlert show];
}
else {
jsonData = [NSJSONSerialization JSONObjectWithData:response options:0 error:&jsonParsingError];
Working around the problem caused by escaped unicode characters by adding this
NSString *escaped = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
NSString *name = [NSString
stringWithCString:[escaped cStringUsingEncoding:NSUTF8StringEncoding]
encoding:NSNonLossyASCIIStringEncoding];
NSData *responseData = [name dataUsingEncoding:NSUTF8StringEncoding];
responseData = [responseData subdataWithRange:NSMakeRange(0, [responseData length]-1)];
and changing
jsonData = [NSJSONSerialization JSONObjectWithData:response options:0 error:&jsonParsingError];
to
jsonData = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&jsonParsingError];
results in a SIGABRT crash.
What am I doing wrong? It WORKS for the first time AFTER product clear but then crashes with EXC_BAD_ACCESS despite using ARC.
My JSON looks like that
[{"line":"ABC","date":"2013-10-02","description":"H\u00e4hnchenbrust mit Calvadosso\u00dfe (1,2,4,8)","art":"type1"},{"line":"DEF","date":"2013-10-02","description":"Frika‌​dellen \u0084Polpette\u0093 (Rind) mit Sardellen und Tomaten (8)","art":"type1"},{"line":"ABC","date":"2013-10-03","description":"Salatteller mit Gem\u00fcseschnitzel (4,2,8)","art":"type2"},{"line":"ABC","date":"2013-10-27","description":"Nudel-H‌​ackfleisch-Pfanne (Rind) mit Schafsk\u00e4se (2,4)","art":"type1"}]

Answer 1

If you want to replace those escape sequences, you can use CFStringTransform:
NSMutableString *escaped = [[NSMutableString alloc] initWithData:response encoding:NSUTF8StringEncoding];
CFStringTransform((__bridge CFMutableStringRef)escaped, NULL, CFSTR("Any-Hex/Java"), YES);
NSData *unescapedData = [escaped dataUsingEncoding:NSUTF8StringEncoding];

Answer 2

I guess I solved the problem. I used a separate class JSONParser.h /.m which was build again and again. I now just parse using the code directly from the parental class and it is working.