diff --git a/client/core/src/filters/currency.js b/client/core/src/filters/currency.js
index a6581830e..c3b9c3873 100644
--- a/client/core/src/filters/currency.js
+++ b/client/core/src/filters/currency.js
@@ -7,8 +7,8 @@ import ngModule from '../module';
  */
 export default function currency() {
     return function(input, symbol, fractionSize) {
-        if (input == null || input === '')
-            return null;
+        if (input === undefined || input === '')
+            return undefined;
         if (typeof input == 'number' && fractionSize)
             input = input.toFixed(fractionSize);
         return `${input} ${symbol}`;
diff --git a/client/core/src/filters/index.js b/client/core/src/filters/index.js
index 80219b5d2..4ce3c9020 100644
--- a/client/core/src/filters/index.js
+++ b/client/core/src/filters/index.js
@@ -3,4 +3,4 @@ import './ucwords';
 import './dash-if-empty';
 import './dateTime';
 import './percentage';
-// import './currency';
+import './currency';