diff --git a/scripts/test-group-report.mjs b/scripts/test-group-report.mjs
index 67a35b16d9ff..793fd540f107 100644
--- a/scripts/test-group-report.mjs
+++ b/scripts/test-group-report.mjs
@@ -414,6 +414,19 @@ function readReportInput(entry) {
   };
 }
 
+export function readReportInputs(entries) {
+  const missing = [];
+  const reports = [];
+  for (const entry of entries) {
+    if (!fs.existsSync(entry.reportPath)) {
+      missing.push(entry);
+      continue;
+    }
+    reports.push(readReportInput(entry));
+  }
+  return { missing, reports };
+}
+
 function readGroupedReport(reportPath) {
   return JSON.parse(fs.readFileSync(reportPath, "utf8"));
 }
@@ -666,9 +679,16 @@ async function main() {
     process.exit(exitCode);
   }
 
-  const reportInputs = runEntries
-    .filter((entry) => fs.existsSync(entry.reportPath))
-    .map(readReportInput);
+  const reportInputsResult = readReportInputs(runEntries);
+  if (reportInputsResult.missing.length > 0) {
+    for (const entry of reportInputsResult.missing) {
+      console.error(
+        `[test-group-report] missing JSON report for ${entry.config}: ${entry.reportPath}`,
+      );
+    }
+    process.exit(1);
+  }
+  const reportInputs = reportInputsResult.reports;
   const report = buildGroupedTestReport({
     groupBy: args.groupBy,
     maxTestMs: args.maxTestMs,
diff --git a/test/scripts/test-group-report.test.ts b/test/scripts/test-group-report.test.ts
index c6084bad75fd..2ebb0be88422 100644
--- a/test/scripts/test-group-report.test.ts
+++ b/test/scripts/test-group-report.test.ts
@@ -1,4 +1,5 @@
 // Test Group Report tests cover test group report script behavior.
+import { spawnSync } from "node:child_process";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
@@ -94,6 +95,28 @@ describe("scripts/test-group-report aggregation", () => {
       },
     ]);
   });
+
+  it("fails missing report inputs instead of writing an empty green report", () => {
+    const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "openclaw-test-group-report-"));
+    const missingReport = path.join(tempDir, "missing.json");
+    const output = path.join(tempDir, "group-report.json");
+    try {
+      const result = spawnSync(
+        process.execPath,
+        ["scripts/test-group-report.mjs", "--report", missingReport, "--output", output],
+        {
+          cwd: process.cwd(),
+          encoding: "utf8",
+        },
+      );
+
+      expect(result.status).toBe(1);
+      expect(result.stderr).toContain(`[test-group-report] missing JSON report for missing`);
+      expect(fs.existsSync(output)).toBe(false);
+    } finally {
+      fs.rmSync(tempDir, { recursive: true, force: true });
+    }
+  });
 });
 
 describe("scripts/test-group-report comparison", () => {