timescore calculation error

squarenotsquare/src/libs/CalculateScore.js

@@ -1,5 +1,10 @@
 export function calculateSquareScore (answers, finalTime) {
   let timeScore = Math.round((60 - finalTime) * 1000);
+
+  if (timeScore < 0) {
+    timeScore = 0;
+  }
+  
   let answerScore = answers * 1000;
   let finalScore = timeScore + answerScore;
   return finalScore;