diff --git a/html/js/chart.js b/html/js/chart.js
index 77d41b2f..d4a69852 100644
--- a/html/js/chart.js
+++ b/html/js/chart.js
@@ -92,7 +92,8 @@
.on("click", () => {
const header = "\"language\",\"mined\",\"analyzed\",\"coverage\"";
const body = data.map(({ x: language, mined, analyzed }) => {
- return `"${language}","${mined}","${analyzed}","${(analyzed / mined).toFixed(4)}"`;
+ const percentage = mined ? analyzed / mined : 0;
+ return `"${language}","${mined}","${analyzed}","${percentage.toFixed(4)}"`;
})
.join("\n");
const content = `${header}\n${body}\n`;