One idea is to force an additional release.  If the error is the same, then 
this is what is causing it.

> On Jun 11, 2018, at 1:31 AM, Alastair Houghton <alast...@alastairs-place.net> 
> wrote:
> 
> On 10 Jun 2018, at 19:14, Dave <d...@looktowindward.com> wrote:
>> 
>> Override the dealloc method and log when its called - its probably being 
>> over-released!
> 
> That isn’t quite as simple as it sounds, because this is NSString we’re 
> talking about, which is a class cluster.  Most actual NSString instances are 
> really NSCFString, though there’s nothing stopping other things from cropping 
> up.  To make this work, you’d have to change the class of the string object 
> for your own subclass (quite possibly using object_setClass(), because 
> there’s a good chance the string object either didn’t come from your code).
> 
> It’s probably better to use the built-in debugging features (zombies and the 
> various memory debugging tools in Instruments, not to mention the debugging 
> features in malloc). 
> 
> Kind regards,
> 
> Alastair.
> 
> --
> http://alastairs-place.net
> 
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