json decode error on some requests but not others with Algolia php library -

i'm seeing following error:

my params are

array (size=4)   'facets' => string 'instock.1' (length=9)   'facetfilters' => string 'instock.1:1' (length=11)   'numericfilters' => string 'itemid!=511283' (length=14)   'getrankinginfo' => int 1 

if remove either getrankinginfo or numericfilters, works requests.

according logs in algolia it's returning results, don't far on end requests.

one response causes error appear is:

request

{   "params": "facets=instock.1&facetfilters=instock.1%3a1&numericfilters=itemid%21%3d511283&getrankinginfo=1&query=warburton+orange+wrapper+800g" } 

response

{   "hits": [     {       "itemid": 506241,       "name": "warburton blue wrapper 800g",       "slug": "506241-warburton-blue-wrapper",       "brand": "warburton",       "supplier_name": "warburtons bread",       "size": "800g",       "status": "l",       "vat_rate": "0.00",       "popularity": 18992,       "image": "/images/products/506241.jpg",       "thumbnail": "/images/products/506241_thumbnail.jpg",       "barcodes": [         "5010044000039"       ],       "branches": [         1,         2,         4,         5,         6       ],       "deepestcategory": "07013033337",       "instock": {         "1": 1,         "2": 0,         "4": 1,         "5": 1,         "6": 1       },       "alternatives": [       ],       "objectid": "506241",       "_highlightresult": {         "name": {           "value": "<em>warburton</em> blue <em>wrapper</em> <em>800g</em>",           "matchlevel": "partial",           "matchedwords": [             "warburton",             "wrapper",             "800g"           ]         },         "barcodes": [           {             "value": "5010044000039",             "matchlevel": "none",             "matchedwords": [             ]           }         ]       },       "_rankinginfo": {         "nbtypos": 0,         "firstmatchedword": 0,         "proximitydistance": 10,         "userscore": 21542,         "geodistance": 0,         "geoprecision": 1,         "nbexactwords": 3,         "words": 3       }     },     {       "itemid": 511294,       "name": "warburton green wrapper ",       "slug": "511294-warburton-green-wrapper",       "brand": "warburton",       "supplier_name": "warburtons bread",       "size": "",       "status": "l",       "vat_rate": "0.00",       "popularity": 78098,       "image": "/images/products/511294.jpg",       "thumbnail": "/images/products/511294_thumbnail.jpg",       "barcodes": [         "5010044002347"       ],       "branches": [         1,         2,         4,         5,         6       ],       "deepestcategory": "07013033337",       "instock": {         "1": 

one works fine is:

request body

{   "params": "facets=instock.1&facetfilters=instock.1%3a1&numericfilters=itemid%21%3d558471&getrankinginfo=1&query=i+can%27t+believe+it%27s+not+butter+2kg" } 

response

{   "hits": [     {       "itemid": 581691,       "name": "i can't believe not butter 500g",       "slug": "581691-i-cant-believe-its-not-butter",       "brand": "i can't believe",       "supplier_name": "u.lever bestfoods (chilled)",       "size": "500g",       "status": "l",       "vat_rate": "0.00",       "popularity": 36597,       "image": "/images/products/581691.jpg",       "thumbnail": "/images/products/581691_thumbnail.jpg",       "barcodes": [         "000118039904",         "05000118039904",         "5000241007009"       ],       "branches": [         1,         2,         3,         4,         5,         6       ],       "deepestcategory": "07015269103",       "instock": {         "1": 1,         "2": 1,         "3": 1,         "4": 1,         "5": 1,         "6": 1       },       "alternatives": [       ],       "objectid": "581691",       "_highlightresult": {         "name": {           "value": "<em>i</em> <em>can't</em> <em>believe</em> <em>its</em> <em>not</em> <em>butter</em> 500g",           "matchlevel": "partial",           "matchedwords": [             "i",             "can",             "t",             "believe",             "it",             "s",             "not",             "butter"           ]         },         "barcodes": [           {             "value": "000118039904",             "matchlevel": "none",             "matchedwords": [             ]           },           {             "value": "05000118039904",             "matchlevel": "none",             "matchedwords": [             ]           },           {             "value": "5000241007009",             "matchlevel": "none",             "matchedwords": [             ]           }         ]       },       "_rankinginfo": {         "nbtypos": 0,         "firstmatchedword": 0,         "proximitydistance": 22,         "userscore": 15914,         "geodistance": 0,         "geoprecision": 1,         "nbexactwords": 6,         "words": 8       }     },     {       "itemid": 247577,       "name": "i can't believe not butter 250g" 

it seems result set causing error json_decode. when limited hitsperpage 10 works fine. answer here paginate large sets, obvious really.

thanks read , commented.