The NoibuJS script instruments existing code to catch hidden errors. This means the Noibu script wraps existing code to surface errors that were not previously reported to the console. If Noibu uncovers a hidden error, this error will appear in the console, and surface in the Stacktrace with the method name nbuWrapper.
Some clients misinterpret this method to mean the error is caused by the NoibuJS script, but this is not the case. Instead, the method indicates the error was only exposed due to Noibu's instrumentation.
Learn more about How to Investigate Fetch API Errors.