ios - How is my code producing this crash: [NSConcreteData count]: unrecognized selector sent to instance -

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i getting crash showing in bugsense:

-[nsconcretedata count]: unrecognized selector sent instance 0x14e57f10 - nsinvalidargumentexception

in code:

+ (nsmutablearray *)applyfilters:(nsmutablearray *)theitems fromfilter:(nsdictionary *)filters {         nsmutablearray *items = [[nsmutablearray alloc] initwitharray:theitems];      if ([[filters allkeys] count] > 0)     {         nsmutablearray *tempfiltereditems = [[nsmutablearray alloc] init];          (nsstring *key in [filters allkeys])         {             nsmutablestring *convertedkey = [nsmutablestring stringwithstring:key];              [convertedkey replaceoccurrencesofstring:@" "                                         withstring:@"_"                                            options:nscaseinsensitivesearch                                              range:nsmakerange(0, [convertedkey length])];              nsarray *tempfilterattributes = [nsarray arraywitharray:filters[key]];              (nsdictionary *item in items)              {                    if (![[item[convertedkey] componentsseparatedbystring:@"*"] firstobjectcommonwitharray:tempfilterattributes])                 {                     if (![tempfiltereditems containsobject:item])                     {                         [tempfiltereditems addobject:item];                     }                 }             }              [items removeobjectsinarray:tempfiltereditems];             [tempfiltereditems removeallobjects];         }             }      return items; }

why/how happening?

stack trace is:

    corefoundation  <redacted> + 130     1   libobjc.a.dylib objc_exception_throw + 38    2   corefoundation  <redacted> + 202     3   corefoundation  <redacted> + 706     4   corefoundation  _cf_forwarding_prep_0 + 24   5   corefoundation  <redacted> + 28  6   video games +[helper applyfilters:fromfilter:] (helper.m:2862)   7   video games -[wishlistviewcontroller loadup] (wishlistviewcontroller.m:409) + 29303  8   video games -[wishlistviewcontroller viewwillappear:] (wishlistviewcontroller.m:363) + 27955     9   uikit   <redacted> + 374     10  uikit   <redacted> + 612     11  uikit   <redacted> + 572     12  uikit   <redacted> + 44  13  uikit   <redacted> + 184     14  uikit   <redacted> + 380     15  quartzcore  <redacted> + 142     16  quartzcore  <redacted> + 350     17  quartzcore  <redacted> + 16  18  quartzcore  <redacted> + 228     19  quartzcore  <redacted> + 314     20  uikit   <redacted> + 126     21  corefoundation  <redacted> + 20  22  corefoundation  <redacted> + 286     23  corefoundation  <redacted> + 738     24  corefoundation  cfrunlooprunspecific + 524   25  corefoundation  cfrunloopruninmode + 106     26  graphicsservices    gseventrunmodal + 138    27  uikit   uiapplicationmain + 1136     28  video games main (main.m:16) + 888911    29  libdyld.dylib   <redacted> + 2

the problem has nothing code provided. error messages says message count sent class nsconcretedata, same nsdata, , such class method not exist.
suggest set exception breakpoint (in xcode select left breakpoint navigator, click + left bottom, , select add exception breakpoint).
when execute app, stop @ faulty instruction.

edit (due stack trace provided now):
stack trace indeed says method applyfilters:fromfilter: responsible crash. place message count sent in method, statement [[filters allkeys] count]. looks count sent nsconcretedata object, , not nsarray object might have expected. 1 reason argument filters, should nsdictionary, object of different type.
when app stops @ exception breakpoint, please check class of instance filters.


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