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Commit 85b04295 authored by Chris Beer's avatar Chris Beer
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Guard against missing canvas groupings; fixes #3437

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src/components/ThumbnailNavigation.js
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...@@ -69,7 +69,7 @@ export class ThumbnailNavigation extends Component { ...@@ -69,7 +69,7 @@ export class ThumbnailNavigation extends Component {
*/ */
calculateScaledSize(index) { calculateScaledSize(index) {
const { thumbnailNavigation, canvasGroupings, position } = this.props; const { thumbnailNavigation, canvasGroupings, position } = this.props;
const canvases = canvasGroupings[index]; const canvases = canvasGroupings[index] || [];
const world = new CanvasWorld(canvases); const world = new CanvasWorld(canvases);
const bounds = world.worldBounds(); const bounds = world.worldBounds();
switch (position) { switch (position) {
......
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