1 files changed, 2 insertions, 3 deletions
diff --git a/src/client/views/AudioWaveform.tsx b/src/client/views/AudioWaveform.tsx
index 0a441552e..0e9c00656 100644
--- a/src/client/views/AudioWaveform.tsx
+++ b/src/client/views/AudioWaveform.tsx
@@ -16,7 +16,6 @@ export interface AudioWaveformProps {
     rawDuration: number; // length of underlying media data
     mediaPath: string;
     layoutDoc: Doc;
-    trimming: boolean;
     clipStart: number;
     clipEnd: number;
     PanelHeight: () => number;
@@ -42,8 +41,8 @@ export class AudioWaveform extends React.Component<AudioWaveformProps> {
             ({ clipStart, clipEnd, fieldKey }) => {
                 if (!this.props.layoutDoc[fieldKey]) {
                     // setting these values here serves as a "lock" to prevent multiple attempts to create the waveform at nerly the same time.
-                    const waveform = Cast(this.props.layoutDoc[this.audioBucketField(0, this.props.rawDuration)], listSpec("number"), []);
-                    this.props.layoutDoc[fieldKey] = new List<number>(waveform.slice(clipStart / this.props.rawDuration * waveform.length, clipEnd / this.props.rawDuration * waveform.length));
+                    const waveform = Cast(this.props.layoutDoc[this.audioBucketField(0, this.props.rawDuration)], listSpec("number"));
+                    this.props.layoutDoc[fieldKey] = waveform && new List<number>(waveform.slice(clipStart / this.props.rawDuration * waveform.length, clipEnd / this.props.rawDuration * waveform.length));
                     setTimeout(() => this.createWaveformBuckets(fieldKey, clipStart, clipEnd));
                 }
             }, { fireImmediately: true });