diff --git a/packages/library/src/claimerProfitablePrizeTxs.ts b/packages/library/src/claimerProfitablePrizeTxs.ts
index b221553..495c20a 100644
--- a/packages/library/src/claimerProfitablePrizeTxs.ts
+++ b/packages/library/src/claimerProfitablePrizeTxs.ts
@@ -564,7 +564,7 @@ const getClaimInfo = async (
 
     // FEES USD
     claimFeesUsd =
-      parseFloat(ethers.utils.formatUnits(claimFees, context.feeToken.decimals)) *
+      parseFloat(ethers.utils.formatUnits(claimFees.toString(), context.feeToken.decimals)) *
       context.feeToken.assetRateUsd;
     if (claimCount > 0) {
       logBigNumber(
diff --git a/packages/library/src/utils/logging.ts b/packages/library/src/utils/logging.ts
index 3a5ee52..a2f805a 100644
--- a/packages/library/src/utils/logging.ts
+++ b/packages/library/src/utils/logging.ts
@@ -1,8 +1,8 @@
-import { ethers } from "ethers";
-import chalk from "chalk";
+import { ethers } from 'ethers';
+import chalk from 'chalk';
 
 export const logTable = (obj: any) => {
-  if (console.table.name === "table") {
+  if (console.table.name === 'table') {
     console.table(obj);
   } else {
     console.log(obj);
@@ -15,20 +15,20 @@ export const logStringValue = (str: string, val: any) => {
 
 export const logBigNumber = (title, bigNumber, decimals, symbol = null) => {
   try {
-    const formatted = ethers.utils.formatUnits(bigNumber, decimals);
+    const formatted = ethers.utils.formatUnits(bigNumber.toString(), decimals);
 
     logStringValue(
       title,
-      `${formatted}${symbol !== null && ` ${symbol}`} (${bigNumber.toString()} wei)`
+      `${formatted}${symbol !== null && ` ${symbol}`} (${bigNumber.toString()} wei)`,
     );
   } catch (e) {
-    console.log(chalk.dim("Unable to log BigNumber:", title));
+    console.log(chalk.dim('Unable to log BigNumber:', title));
   }
 };
 
 export const printAsterisks = () => {
   printSpacer();
-  console.log(chalk.blue("******************"));
+  console.log(chalk.blue('******************'));
 };
 
-export const printSpacer = () => console.log("");
+export const printSpacer = () => console.log('');