ios - GoogleTagManager warning: Unexpected type in Builder: (null) -

i using googletagmanager implement enhanced e-commerce (google analytics) tried pushing below datalayer gtm.

 [datalayer push:@{@"event",@"purchase",                 @"ecommerce": @{                 @"purchase": @{                   @"actionfield": @{                     @"id": @"t12345",                         // transaction id. required purchases , refunds.                     @"affiliation": @"online store",                     @"revenue": @"35.43",                     // total transaction value (incl. tax , shipping)                     @"tax":"4.90",                     @"shipping": @"5.99",                     @"coupon": @"summer_sale"},                   @"products": @[                             // list of productfieldobjects.                     @{@"name": @"triblend android t-shirt",   // name or id required.                       @"id": @"12345",                       @"price": @"15.25",                       @"brand": @"google",                       @"category": @"apparel",                       @"variant": @"gray",                       @"quantity": @1,                       @"coupon": @""},                        // optional fields may omitted or set empty string.                     @{@"name": @"donut friday scented t-shirt",                       @"id": @"67890",                       @"price": @"33.75",                       @"brand": @"google",                       @"category": @"apparel",                       @"variant": @"black",                       @"quantity": @1}]}}}];  

this sample data google tag manager tutorial. following warning message when trying send hits google.

googletagmanager warning: unexpected type in builder: (null) 

the data type using nsnumber (price[doube],revenue[double] & quantity[int]) & nsstring others.

the above data-types work proper other ecommerce tags "addtocart","checkout" etc.. "purchase" isn't working..

can 1 suggest else can tried?

i ran problem while back. looks me conflict previous ecommerce stuff.

before u send purchase event, try clearing ecommerce object

[self.tagdatalayer push:@{@"ecommerce":[nsnull null]}]; 

this worked out me