diff --git a/dist/index.js b/dist/index.js
index 9dc5514..a3fbafc 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -13907,6 +13907,8 @@ const ICONS = {
 const CRITERIAS = ["lines", "branches", "functions", "statements"];
 
 function _renderPct(pct, addSign = true) {
+  if (!pct.toFixed) { return pct }
+  
   if (addSign && pct >= 0) {
     return `+${pct.toFixed(2)}%`;
   }
diff --git a/src/diff.js b/src/diff.js
index 963ba75..18d8f1b 100644
--- a/src/diff.js
+++ b/src/diff.js
@@ -9,6 +9,8 @@ const ICONS = {
 const CRITERIAS = ["lines", "branches", "functions", "statements"];
 
 function _renderPct(pct, addSign = true) {
+  if (!pct.toFixed) { return pct }
+  
   if (addSign && pct >= 0) {
     return `+${pct.toFixed(2)}%`;
   }