Fix NPE in DateField range handling (#15342)

The NPE was introduced by 206055708b0a8e1c17a8c63d482a5e202d3ebf6d.

Change-Id: I34401e108f7c02ee2f0aab581a78b9ab468b2b46

1 files changed, 4 insertions, 2 deletions

diff --git a/server/src/com/vaadin/ui/DateField.java b/server/src/com/vaadin/ui/DateField.java
index d5700c4b65..3d683f4902 100644
--- a/server/src/com/vaadin/ui/DateField.java
+++ b/server/src/com/vaadin/ui/DateField.java
@@ -319,7 +319,8 @@ public class DateField extends AbstractField<Date> implements
 
         // Create a defensive copy against issues when using java.sql.Date (and
         // also against mutable Date).
-        getState().rangeStart = new Date(startDate.getTime());
+        getState().rangeStart = startDate != null ? new Date(
+                startDate.getTime()) : null;
         updateRangeValidator();
     }
 
@@ -439,7 +440,8 @@ public class DateField extends AbstractField<Date> implements
 
         // Create a defensive copy against issues when using java.sql.Date (and
         // also against mutable Date).
-        getState().rangeEnd = new Date(endDate.getTime());
+        getState().rangeEnd = endDate != null ? new Date(endDate.getTime())
+                : null;
         updateRangeValidator();
     }