diff --git a/Source/PluginEditor.cpp b/Source/PluginEditor.cpp
index 0323ee1..84c0afc 100644
--- a/Source/PluginEditor.cpp
+++ b/Source/PluginEditor.cpp
@@ -116,6 +116,8 @@ void PaulstretchpluginAudioProcessorEditor::timerCallback(int id)
 		String infotext = String(processor.getPreBufferingPercent(), 1) + "% buffered " 
 			+ String(processor.getStretchSource()->m_param_change_count)+" param changes "+m_last_err+" FFT size "+
 			String(processor.getStretchSource()->getFFTSize());
+		if (processor.m_abnormal_output_samples > 0)
+			infotext += " " + String(processor.m_abnormal_output_samples) + " invalid sample values";
 		m_info_label.setText(infotext, dontSendNotification);
 	}
 	if (id == 2)
diff --git a/Source/PluginProcessor.cpp b/Source/PluginProcessor.cpp
index 7b2b977..caa7dfe 100644
--- a/Source/PluginProcessor.cpp
+++ b/Source/PluginProcessor.cpp
@@ -416,6 +416,15 @@ void PaulstretchpluginAudioProcessor::processBlock (AudioSampleBuffer& buffer, M
 	
 	AudioSourceChannelInfo aif(buffer);
 	m_buffering_source->getNextAudioBlock(aif);
+	for (int i = 0; i < buffer.getNumChannels(); ++i)
+	{
+		for (int j = 0; j < buffer.getNumSamples(); ++j)
+		{
+			float sample = buffer.getSample(i,j);
+			if (std::isnan(sample) || std::isinf(sample))
+				++m_abnormal_output_samples;
+		}
+	}
 }
 
 //==============================================================================
diff --git a/Source/PluginProcessor.h b/Source/PluginProcessor.h
index b5bbedb..91144ac 100644
--- a/Source/PluginProcessor.h
+++ b/Source/PluginProcessor.h
@@ -110,6 +110,7 @@ public:
 	double getPreBufferingPercent();
 	void timerCallback(int id) override;
 	double getSampleRateChecked();
+	int m_abnormal_output_samples = 0;
 private: