Running NPAPI plugin on High Sierra

Did somebody face with the issue to run NPAPI plugin under Safari on High Sierra?

The plugin runs fine on the Sierra but on the High Sierra there is a error message: Page (pid: xxxx) plug-in failed on page <<private>>

The plugin was compiled as x86_86 code by Xcode 8.3.3 and additionally by Xcode 9 as well. While trying to run the plugin, OS was crashed two times.

Are there any ideas about this issue?