diff --git a/internal/handler/config.go b/internal/handler/config.go
index ccd33543..a736a724 100644
--- a/internal/handler/config.go
+++ b/internal/handler/config.go
@@ -755,7 +755,9 @@ func (h *ConfigHandler) UpdateConfig(c *gin.Context) {
 		if req.MultiAgent.PlanExecuteLoopMaxIterations != nil {
 			h.config.MultiAgent.PlanExecuteLoopMaxIterations = *req.MultiAgent.PlanExecuteLoopMaxIterations
 		}
-		h.config.MultiAgent.EinoMiddleware.ToolSearchAlwaysVisibleTools = dedupeToolNameList(req.MultiAgent.ToolSearchAlwaysVisibleTools)
+		if req.MultiAgent.ToolSearchAlwaysVisibleTools != nil {
+			h.config.MultiAgent.EinoMiddleware.ToolSearchAlwaysVisibleTools = dedupeToolNameList(*req.MultiAgent.ToolSearchAlwaysVisibleTools)
+		}
 		h.logger.Info("更新多代理配置",
 			zap.Bool("enabled", h.config.MultiAgent.Enabled),
 			zap.Bool("robot_use_multi_agent", h.config.MultiAgent.RobotUseMultiAgent),