diff --git a/src/audio/WaveFileReader.cpp b/src/audio/WaveFileReader.cpp
index 45600fe..898c457 100644
--- a/src/audio/WaveFileReader.cpp
+++ b/src/audio/WaveFileReader.cpp
@@ -185,7 +185,7 @@ int WaveFileReader::getSampleIndex() {
 }
 
 void WaveFileReader::seek(int sampleIndex) {
-	if (sampleIndex < 0 || sampleIndex >= sampleCount) throw std::invalid_argument("sampleIndex out of range.");
+	if (sampleIndex < 0 || sampleIndex > sampleCount) throw std::invalid_argument("sampleIndex out of range.");
 
 	file.seekg(dataOffset + static_cast<std::streamoff>(sampleIndex * channelCount * bytesPerSample));
 	this->sampleIndex = sampleIndex;
diff --git a/src/main.cpp b/src/main.cpp
index 35567cb..4416ca7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -50,20 +50,22 @@ ptree createXmlTree(const path& filePath, const Timeline<Phone>& phones, const T
 	ptree tree;
 
 	// Add sound file path
-	tree.add("rhubarbResult.info.soundFile", filePath.string());
+	tree.put("rhubarbResult.info.soundFile", filePath.string());
 
 	// Add phones
+	tree.put("rhubarbResult.phones", "");
 	for (auto& timedPhone : phones) {
 		ptree& phoneElement = tree.add("rhubarbResult.phones.phone", timedPhone.getValue());
-		phoneElement.add("<xmlattr>.start", formatDuration(timedPhone.getStart()));
-		phoneElement.add("<xmlattr>.duration", formatDuration(timedPhone.getLength()));
+		phoneElement.put("<xmlattr>.start", formatDuration(timedPhone.getStart()));
+		phoneElement.put("<xmlattr>.duration", formatDuration(timedPhone.getLength()));
 	}
 
 	// Add mouth cues
+	tree.put("rhubarbResult.mouthCues", "");
 	for (auto& timedShape : shapes) {
 		ptree& mouthCueElement = tree.add("rhubarbResult.mouthCues.mouthCue", timedShape.getValue());
-		mouthCueElement.add("<xmlattr>.start", formatDuration(timedShape.getStart()));
-		mouthCueElement.add("<xmlattr>.duration", formatDuration(timedShape.getLength()));
+		mouthCueElement.put("<xmlattr>.start", formatDuration(timedShape.getStart()));
+		mouthCueElement.put("<xmlattr>.duration", formatDuration(timedShape.getLength()));
 	}
 
 	return tree;
diff --git a/src/phoneExtraction.cpp b/src/phoneExtraction.cpp
index e5fdf04..42b315e 100644
--- a/src/phoneExtraction.cpp
+++ b/src/phoneExtraction.cpp
@@ -288,6 +288,11 @@ Timeline<Phone> detectPhones(
 	boost::optional<std::string> dialog,
 	ProgressSink& progressSink)
 {
+	// Pocketsphinx doesn't like empty input
+	if (audioStream->getTruncatedRange().getLength() == centiseconds::zero()) {
+		return Timeline<Phone>{};
+	}
+
 	// Discard Pocketsphinx output
 	err_set_logfp(nullptr);