diff --git a/src/main/java/cokr/xit/foundation/data/DataFormat.java b/src/main/java/cokr/xit/foundation/data/DataFormat.java
index 722f08c..8463a86 100644
--- a/src/main/java/cokr/xit/foundation/data/DataFormat.java
+++ b/src/main/java/cokr/xit/foundation/data/DataFormat.java
@@ -107,7 +107,7 @@ public class DataFormat extends AbstractComponent {
 		if (obj == null)
 			num = 0;
 		else if (obj instanceof String)
-			num = Double.valueOf((String)obj);
+			num = Double.valueOf(ifEmpty((String)obj, "0"));
 		else if (obj instanceof Number)
 			num = (Number)obj;
 		else