Fix attributes copying

1 files changed, 7 insertions, 3 deletions

diff --git a/src/org/traccar/processing/CopyAttributesHandler.java b/src/org/traccar/processing/CopyAttributesHandler.java
index a9e761c3d..9fbcfa73f 100644
--- a/src/org/traccar/processing/CopyAttributesHandler.java
+++ b/src/org/traccar/processing/CopyAttributesHandler.java
@@ -32,10 +32,14 @@ public class CopyAttributesHandler extends BaseDataHandler {
     @Override
     protected Position handlePosition(Position position) {
         String attributesString = Context.getDeviceManager().lookupAttributeString(
-                position.getDeviceId(), "processing.copyAttributes", null, true);
+                position.getDeviceId(), "processing.copyAttributes", "", true);
         Position last = getLastPosition(position.getDeviceId());
-        if (attributesString != null && last != null) {
-            attributesString += Position.KEY_DRIVER_UNIQUE_ID + ",";
+        if (attributesString.isEmpty()) {
+            attributesString = Position.KEY_DRIVER_UNIQUE_ID;
+        } else {
+            attributesString += "," + Position.KEY_DRIVER_UNIQUE_ID;
+        }
+        if (last != null) {
             for (String attribute : attributesString.split("[ ,]")) {
                 if (last.getAttributes().containsKey(attribute) && !position.getAttributes().containsKey(attribute)) {
                     position.getAttributes().put(attribute, last.getAttributes().get(attribute));