fallback on empty string

src/components/BalanceSummary/index.js

@@ -61,7 +61,9 @@ const BalanceSummary = ({
                   currency={counterValue}
                   tickXScale={selectedTime}
                   renderTickY={(val, account) =>
-                    account ? formatCurrencyUnit(account.unit, val) : val
+                    account
+                      ? formatCurrencyUnit(account.unit, val)
+                      : formatCurrencyUnit(counterValue.units[0], val)
                   }
                   renderTooltip={
                     isAvailable && !account

src/components/base/Chart/index.js

@@ -59,7 +59,7 @@ export type Props = {
   dateFormat?: string, // eslint-disable-line react/no-unused-prop-types
   isInteractive?: boolean, // eslint-disable-line react/no-unused-prop-types
   renderTooltip?: Function, // eslint-disable-line react/no-unused-prop-types
-  renderTickY?: (t: number, account: Account) => mixed, // eslint-disable-line react/no-unused-prop-types
+  renderTickY?: (t: number, account: ?Account) => mixed, // eslint-disable-line react/no-unused-prop-types
 }
 
 class Chart extends PureComponent<Props> {
@@ -72,7 +72,7 @@ class Chart extends PureComponent<Props> {
     isInteractive: true,
     tickXScale: 'month',
     renderTickY: (t: number, account: Account): mixed =>
-      account ? formatShort(account.unit, t) : t,
+      account ? formatShort(account.unit, t) : '',
   }
 
   componentDidMount() {

src/components/base/Chart/refreshDraw.js

@@ -87,7 +87,7 @@ export default function refreshDraw({ ctx, props }: { ctx: CTX, props: Props })
       d3
         .axisLeft(y)
         .ticks(3)
-        .tickFormat(val => (renderTickY && account ? renderTickY(val, account) : val)),
+        .tickFormat(val => renderTickY(val, account)),
     )
     NODES.axisBot.call(
       d3