diff --git a/lib/utils.js b/lib/utils.js
index eb422a0..327f899 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -261,7 +261,7 @@ export function getNewCanvasAndCtx (width, height) {
     canvas = new OffscreenCanvas(width, height)
     ctx = canvas.getContext('2d')
     if (ctx === null) {
-      throw new Error('getContext of OffscreenCanvas returns null')
+      throw new Error("getContext of OffscreenCanvas returns null")
     }
   } catch (e) {
     canvas = document.createElement('canvas')