diff --git a/app/api/canvas/clawd-chat/route.ts b/app/api/canvas/clawd-chat/route.ts
index a23c4352e..24a8d5ab7 100644
--- a/app/api/canvas/clawd-chat/route.ts
+++ b/app/api/canvas/clawd-chat/route.ts
@@ -240,8 +240,8 @@ type OpenClawBackgroundTask = {
   displayText: string;
   updatedAt: string;
   completed: number;
-  total: number;
-  progressPercent: number;
+  total: number | null;
+  progressPercent: number | null;
   pollEndpoint: string;
   pollAfterMs: number;
   maxWaitSeconds: number;
@@ -269,16 +269,17 @@ function parseOpenClawBackgroundTask(
   if (!jobId || !state) return null;
 
   const completed = Math.max(0, Number(rawTask.completed) || 0);
-  const total = Math.max(1, Number(rawTask.total) || 1);
-  const progressPercent = Math.max(
-    0,
-    Math.min(
-      100,
-      Number.isFinite(Number(rawTask.progress_percent))
-        ? Number(rawTask.progress_percent)
-        : Math.round((completed * 100) / total)
-    )
-  );
+  const parsedTotal = Number(rawTask.total);
+  const total =
+    Number.isFinite(parsedTotal) && parsedTotal > 0 ? parsedTotal : null;
+  const parsedProgressPercent = Number(rawTask.progress_percent);
+  const progressPercent =
+    rawTask.progress_percent != null &&
+    Number.isFinite(parsedProgressPercent)
+      ? Math.max(0, Math.min(100, parsedProgressPercent))
+      : total
+        ? Math.round((completed * 100) / total)
+        : null;
 
   return {
     jobId,
@@ -323,8 +324,10 @@ function buildOpenClawTaskProgress(task: OpenClawBackgroundTask) {
       task.phase ||
       (task.state === "processing" ? "任务正在处理" : "任务状态已更新"),
     completed: task.completed,
-    total: task.total,
-    progress_percent: task.progressPercent,
+    ...(task.total != null ? { total: task.total } : {}),
+    ...(task.progressPercent != null
+      ? { progress_percent: task.progressPercent }
+      : {}),
     stage: task.stage,
     state: task.state,
     updated_at: task.updatedAt,
@@ -524,7 +527,7 @@ function streamOpenClawBackgroundTask(params: {
           nextTask.stage,
           nextTask.updatedAt,
           nextTask.completed,
-          nextTask.total,
+          nextTask.total ?? "",
           progress.message,
         ].join("|");
         if (key === lastProgressKey) return;
@@ -572,8 +575,10 @@ function streamOpenClawBackgroundTask(params: {
                   message: "任务仍在运行，正在重新连接进度服务",
                   display: "任务仍在运行，正在重新连接进度服务",
                   completed: task.completed,
-                  total: task.total,
-                  progress_percent: task.progressPercent,
+                  ...(task.total != null ? { total: task.total } : {}),
+                  ...(task.progressPercent != null
+                    ? { progress_percent: task.progressPercent }
+                    : {}),
                 })
               )
             );
diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index e4eb7eda8..a8a080001 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -543,8 +543,12 @@ function normalizeClawdProgressEvent(
     currentOrderId,
     completed:
       Number.isFinite(completed) && completed >= 0 ? completed : undefined,
-    total: Number.isFinite(total) && total > 0 ? total : undefined,
+    total:
+      progress.total != null && Number.isFinite(total) && total > 0
+        ? total
+        : undefined,
     progressPercent:
+      progress.progress_percent != null &&
       Number.isFinite(progressPercent) &&
       progressPercent >= 0 &&
       progressPercent <= 100