diff --git a/plugins/stats_dashboard/templates/robot_management.html b/plugins/stats_dashboard/templates/robot_management.html
index d8006e1..56146a3 100644
--- a/plugins/stats_dashboard/templates/robot_management.html
+++ b/plugins/stats_dashboard/templates/robot_management.html
@@ -433,10 +433,11 @@
                 axios.get(`/api/robot/group/${this.currentGroupId}/message_trend?days=${this.trendDays}`)
                     .then(response => {
                         if (response.data.success) {
-                            this.$nextTick(() => {
+                            // 使用setTimeout确保DOM已完全渲染
+                            setTimeout(() => {
                                 this.renderTrendChart(response.data.data);
                                 this.trendLoading = false;
-                            });
+                            }, 300);
                         } else {
                             this.$message.error('加载消息趋势失败');
                             this.trendLoading = false;
@@ -451,7 +452,17 @@
             
             renderTrendChart(data) {
                 try {
-                    const ctx = document.getElementById('messageTrendChart').getContext('2d');
+                    // 获取Canvas元素
+                    const canvas = document.getElementById('messageTrendChart');
+                    
+                    if (!canvas) {
+                        console.error('找不到Canvas元素，ID: messageTrendChart');
+                        this.$message.error('无法找到图表元素，请尝试重新打开对话框');
+                        this.trendLoading = false;
+                        return;
+                    }
+                    
+                    const ctx = canvas.getContext('2d');
                     
                     // 销毁旧图表
                     if (this.charts.trendChart) {