VST Host crashes when NI Maschine2 VST is disabled internally

Audio Plugins
1

I am developing a VST host software (currently on Windows). All works fine so far.

However if I load NI Maschine2 as VST3 and open its UI and press the on/off button next to the NI logo in the title bar inside maschine my host crashes in

juce::VST3PluginInstance::processAudio(juce::AudioBuffer & buffer, juce::MidiBuffer & midiMessages, Steinberg::Vst::SymbolicSampleSizes sampleSize, bool isProcessBlockBypassedCall)

with a nullptr exception.

I tested the same in Bitwig and AudioHostPlugin, both just silence the output when i press the button inside maschine. My code to invoke processing is:

if (auto plugin = device->plugin()) {
    bool process_bypassed = plugin->isSuspended() || device->muted();
    if (!process_bypassed) {
        if (auto bypass = plugin->getBypassParameter()) {
            if (juce::approximatelyEqual(bypass->getValue(), 0.0f)==false) {
                process_bypassed = true;
            }
        }
    }
    try {
        if (!process_bypassed) {
            plugin->processBlock(buffer, midi);
        }
        else {
            plugin->processBlockBypassed(buffer, midi);
        }
    }
    catch (...) {
    }
}

I assume I have to use processBlockBypassed to avoid the crash but I can not figure out the state change of the VST3. I am also using a juce::AudioProcessorListener to listen to the VST but I do not get any callbacks before the crash.

Any advice would be highly appreciated.