diff --git a/bolt/lib/Profile/DataAggregator.cpp b/bolt/lib/Profile/DataAggregator.cpp
index 3604fdd3a94b4..07f21187b5edd 100644
--- a/bolt/lib/Profile/DataAggregator.cpp
+++ b/bolt/lib/Profile/DataAggregator.cpp
@@ -432,7 +432,18 @@ int DataAggregator::prepareToParse(StringRef Name, PerfProcessInfo &Process,
   if (PI.ReturnCode != 0) {
     ErrorOr<std::unique_ptr<MemoryBuffer>> ErrorMB =
         MemoryBuffer::getFileOrSTDIN(Process.StderrPath.data());
-    StringRef ErrBuf = (*ErrorMB)->getBuffer();
+    std::string ErrMsg;
+    StringRef ErrBuf;
+    if (std::error_code EC = ErrorMB.getError()) {
+      ErrMsg = "PERF2BOLT: cannot open ";
+      ErrMsg += Process.StderrPath.data();
+      ErrMsg += ": ";
+      ErrMsg += EC.message();
+      ErrMsg += '\n';
+      ErrBuf = ErrMsg;
+    } else {
+      ErrBuf = (*ErrorMB)->getBuffer();
+    }
 
     deleteTempFiles();
     Callback(PI.ReturnCode, ErrBuf);