diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/conf/SupportRefreshProperties.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/conf/SupportRefreshProperties.java
index f1b2586ea..1074a85c5 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/conf/SupportRefreshProperties.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/conf/SupportRefreshProperties.java
@@ -66,6 +66,6 @@ public class SupportRefreshProperties {
     @Value(value = "${workflow.alter.intervalUnit:minutes}")
     private TimeUnit alterIntervalUnit;
 
-    @Value(value = "${workflow.alter.mobiles}")
+    @Value(value = "${workflow.alter.mobiles:}")
     private List<String> alterMobiles;
 }