diff --git a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/support/RpcUtils.java b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/support/RpcUtils.java
index 53cd36894de..228392fe021 100644
--- a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/support/RpcUtils.java
+++ b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/support/RpcUtils.java
@@ -317,7 +317,7 @@ public static Long convertToNumber(Object obj) {
                 timeout = Long.parseLong((String) obj);
             } else if (obj instanceof Number) {
                 timeout = ((Number) obj).longValue();
-            } else {
+            } else if (obj != null) {
                 timeout = Long.parseLong(obj.toString());
             }
         } catch (Exception e) {