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kotlinlang

Hello
I use ktor-client/curl in KN/macos
```        return runBlocking {
            <http://client.post|client.post>&lt;String&gt;(url) {
                contentType(ContentType.Application.Json)
                body = json
            }
        }```
When server response 200 it’s OK
But when I make wrong request and server response `400 Bad Request` I have got error on `<http://client.post|client.post>&lt;String&gt;(url)` line
```kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen kotlin.collections.HashMap@d7847578
        at 0   xpoint-sdk.kexe                     0x0000000103325b07 kfun:kotlin.Throwable.&lt;init&gt;(kotlin.String?)kotlin.Throwable + 87 (/Users/teamcity3/buildAgent/work/4d622a065c544371/runtime/src/main/kotlin/kotlin/Throwable.kt:22:37)
        at 1   xpoint-sdk.kexe                     0x000000010331efb5 kfun:kotlin.Exception.&lt;init&gt;(kotlin.String?)kotlin.Exception + 85 (/Users/teamcity3/buildAgent/work/4d622a065c544371/runtime/src/main/kotlin/kotlin/Exceptions.kt:23:44)
        at 2   xpoint-sdk.kexe                     0x000000010331f155 kfun:kotlin.RuntimeException.&lt;init&gt;(kotlin.String?)kotlin.RuntimeException + 85 (/Users/teamcity3/buildAgent/work/4d622a065c544371/runtime/src/main/kotlin/kotlin/Exceptions.kt:34:44)
        at 3   xpoint-sdk.kexe                     0x0000000103353d75 kfun:kotlin.native.concurrent.InvalidMutabilityException.&lt;init&gt;(kotlin.String)kotlin.native.concurrent.InvalidMutabilityException + 85 (/Users/teamcity3/buildAgent/work/4d622a065c544371/runtime/src/main/kotlin/kotlin/native/concurrent/Freezing.kt:22:60)
        at 4   xpoint-sdk.kexe                     0x00000001033555f8 ThrowInvalidMutabilityException + 680 (/Users/teamcity3/buildAgent/work/4d622a065c544371/runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt:90:11)
...```
What have I done wrong?

Have a look at this issue. Also contains a hotfix: <https://github.com/ktorio/ktor/issues/1820>

It says Windows but apparently it's a problem on all native platforms

That issue doesn't occur with the *linuxX64* target although it used to occur in earlier Kotlin versions.