diff --git a/packages/core/src/MPEContract.js b/packages/core/src/MPEContract.js
index e3ae434..c0fb776 100644
--- a/packages/core/src/MPEContract.js
+++ b/packages/core/src/MPEContract.js
@@ -237,10 +237,10 @@ class MPEContract {
   async _fundEscrowAccount(account, amountInCogs) {
     const address = await account.getAddress();
     let currentEscrowBalance = await this.balance(address);
-    currentEscrowBalance = toBNString(currentEscrowBalance);
-    amountInCogs = toBNString(amountInCogs);
-    if(amountInCogs > currentEscrowBalance) {
-      await account.depositToEscrowAccount(amountInCogs - currentEscrowBalance);
+    currentEscrowBalance = new BigNumber(currentEscrowBalance);
+    amountInCogs = new BigNumber(amountInCogs);
+    if(amountInCogs.isGreaterThan(currentEscrowBalance)) {
+      await account.depositToEscrowAccount(amountInCogs.minus(currentEscrowBalance));
     }
   }
 
diff --git a/packages/web/package.json b/packages/web/package.json
index 637edc4..fa42487 100644
--- a/packages/web/package.json
+++ b/packages/web/package.json
@@ -1,6 +1,6 @@
 {
   "name": "snet-sdk-web",
-  "version": "4.1.1",
+  "version": "4.1.2",
   "description": "SingularityNET SDK for Web",
   "main": "./dist/index.js",
   "files": [