diff --git a/ts/client/src/accounts/mangoAccount.ts b/ts/client/src/accounts/mangoAccount.ts
index c627e5f97..482b8f2bf 100644
--- a/ts/client/src/accounts/mangoAccount.ts
+++ b/ts/client/src/accounts/mangoAccount.ts
@@ -96,11 +96,12 @@ export class MangoAccount {
     sourceBank: Bank,
     nativeTokenPosition: TokenPosition,
   ): I80F48 {
-    return nativeTokenPosition
-      .native(sourceBank)
+    return nativeTokenPosition ?
+      nativeTokenPosition.native(sourceBank)
       .mul(I80F48.fromNumber(Math.pow(10, QUOTE_DECIMALS)))
       .div(I80F48.fromNumber(Math.pow(10, sourceBank.mintDecimals)))
-      .mul(sourceBank.price);
+      .mul(sourceBank.price)
+      : ZERO_I80F48;
   }
 
   static getEquivalentNativeTokenPosition(