diff --git a/src/uk/co/majenko/audiobookrecorder/Sentence.java b/src/uk/co/majenko/audiobookrecorder/Sentence.java
index 9621ddc..917a818 100644
--- a/src/uk/co/majenko/audiobookrecorder/Sentence.java
+++ b/src/uk/co/majenko/audiobookrecorder/Sentence.java
@@ -2147,7 +2147,9 @@ public class Sentence extends BookTreeNode implements Cacheable {
     }
 
     public void clearPeakGainPoints() {
-        gainPoints.clear();
+		if (gainPoints != null) {
+	        gainPoints.clear();
+		}
     }
 
     public void autoAddPeakGainPoints() {