diff --git a/designer-base/src/main/java/com/fr/design/fun/impl/AbstractReportLengthUNITProvider.java b/designer-base/src/main/java/com/fr/design/fun/impl/AbstractReportLengthUNITProvider.java
index b550b07c1..da77c947f 100644
--- a/designer-base/src/main/java/com/fr/design/fun/impl/AbstractReportLengthUNITProvider.java
+++ b/designer-base/src/main/java/com/fr/design/fun/impl/AbstractReportLengthUNITProvider.java
@@ -36,6 +36,7 @@ public abstract class AbstractReportLengthUNITProvider extends AbstractProvider
 
     @Override
     public UNIT float2UNIT(float value) {
-        return null;
+        return UNIT.ZERO;
     }
 }
+