diff --git a/src/com/android/calculator2/CalculatorExpressionEvaluator.java b/src/com/android/calculator2/CalculatorExpressionEvaluator.java
index 85d719b..5a43570 100644
--- a/src/com/android/calculator2/CalculatorExpressionEvaluator.java
+++ b/src/com/android/calculator2/CalculatorExpressionEvaluator.java
@@ -54,7 +54,7 @@
         }
 
         try {
-            if (expr.length() == 0 || Double.valueOf(expr) != null) {
+            if (expr.length() == 0 /*|| Double.valueOf(expr) != null*/) {
                 callback.onEvaluate(expr, null, Calculator.INVALID_RES_ID);
                 return;
             }