Illegal callback invocation from native module. This callback type only permits a single invocation from native code.

[adamivancza]

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Describe the bug
When evaluating a JSON flag there is an unhandled exception.

To reproduce
Evaluate a JSON flag

Expected behavior
Do not crash when evaluating a JSON flag

Logs

SDK version
Started to happen in version 6.3.1, but I'm using 7.0.2 now

Language version, developer tools
For instance, Go 1.11 or Ruby 2.5.3. If you are using a language that requires a separate compiler, such as C, please include the name and version of the compiler too.

OS/platform
For instance, Ubuntu 16.04, Windows 10, or Android 4.0.3. If your code is running in a browser, please also include the browser type and version.

Additional context
Based on git blame this commit is causing this issue: a01ed3d
I've compared how other flags are evaluated and there is a big difference in the JSON evaluation:

Basically, I think we need to get rid of line 173 here: a01ed3d#diff-cd97361c4f9361640dd6bed725225b77187ed86a1465713e326390be4ed932b6R173

[yusinto]

This has been fixed in 7.0.3. Thanks @adamivancza for reporting and fixing this.