diff --git a/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx b/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx
index d647bba80a..9ac78e80e7 100644
--- a/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx
+++ b/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx
@@ -20,7 +20,7 @@ interface EthWethConversionDialogProps {
     onCancelled: () => void;
     isOpen: boolean;
     token: Token;
-    etherBalanceInWei: BigNumber;
+    etherBalanceInWei?: BigNumber;
     lastForceTokenStateRefetch: number;
 }
 
@@ -60,7 +60,7 @@ export class EthWethConversionDialog extends React.Component<
             <FlatButton key="convert" label="Convert" primary={true} onTouchTap={this._onConvertClick.bind(this)} />,
         ];
         const title = this.props.direction === Side.Deposit ? 'Wrap ETH' : 'Unwrap WETH';
-        return (
+        return !_.isUndefined(this.props.etherBalanceInWei) ? (
             <Dialog
                 title={title}
                 titleStyle={{ fontWeight: 100 }}
@@ -70,7 +70,7 @@ export class EthWethConversionDialog extends React.Component<
             >
                 {this._renderConversionDialogBody()}
             </Dialog>
-        );
+        ) : null;
     }
     private _renderConversionDialogBody(): React.ReactNode {
         const explanation =
diff --git a/packages/website/ts/components/eth_weth_conversion_button.tsx b/packages/website/ts/components/eth_weth_conversion_button.tsx
index 2fb35cc1c7..4b91a2ebdc 100644
--- a/packages/website/ts/components/eth_weth_conversion_button.tsx
+++ b/packages/website/ts/components/eth_weth_conversion_button.tsx
@@ -18,7 +18,7 @@ interface EthWethConversionButtonProps {
     ethToken: Token;
     dispatcher: Dispatcher;
     blockchain: Blockchain;
-    userEtherBalanceInWei?: BigNumber;
+    userEtherBalanceInWei: BigNumber;
     isOutdatedWrappedEther: boolean;
     onConversionSuccessful?: () => void;
     isDisabled?: boolean;
diff --git a/packages/website/ts/components/eth_wrappers.tsx b/packages/website/ts/components/eth_wrappers.tsx
index 80929113b8..b84e15857f 100644
--- a/packages/website/ts/components/eth_wrappers.tsx
+++ b/packages/website/ts/components/eth_wrappers.tsx
@@ -97,10 +97,9 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             EtherscanLinkSuffixes.Address,
         );
         const tokenLabel = this._renderToken('Wrapped Ether', etherToken.address, configs.ICON_URL_BY_SYMBOL.WETH);
-        const userEtherBalanceInEth = Web3Wrapper.toUnitAmount(
-            this.props.userEtherBalanceInWei,
-            constants.DECIMAL_PLACES_ETH,
-        );
+        const userEtherBalanceInEth = !_.isUndefined(this.props.userEtherBalanceInWei)
+            ? Web3Wrapper.toUnitAmount(this.props.userEtherBalanceInWei, constants.DECIMAL_PLACES_ETH)
+            : undefined;
         const rootClassName = this.props.isFullWidth ? 'clearfix' : 'clearfix lg-px4 md-px4 sm-px2';
         return (
             <div className={rootClassName} style={{ minHeight: 600 }}>
@@ -148,7 +147,11 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
                                         </div>
                                     </TableRowColumn>
                                     <TableRowColumn>
-                                        {userEtherBalanceInEth.toFixed(configs.AMOUNT_DISPLAY_PRECSION)} ETH
+                                        {!_.isUndefined(userEtherBalanceInEth) ? (
+                                            `${userEtherBalanceInEth.toFixed(configs.AMOUNT_DISPLAY_PRECSION)} ETH`
+                                        ) : (
+                                            <i className="zmdi zmdi-spinner zmdi-hc-spin" />
+                                        )}
                                     </TableRowColumn>
                                     <TableRowColumn>
                                         <EthWethConversionButton
@@ -162,6 +165,7 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
                                             dispatcher={this.props.dispatcher}
                                             blockchain={this.props.blockchain}
                                             userEtherBalanceInWei={this.props.userEtherBalanceInWei}
+                                            isDisabled={_.isUndefined(userEtherBalanceInEth)}
                                         />
                                     </TableRowColumn>
                                 </TableRow>