diff --git a/src/common/windows/pdb_source_line_writer.cc b/src/common/windows/pdb_source_line_writer.cc
index ca0c6a39..25a1ca05 100644
--- a/src/common/windows/pdb_source_line_writer.cc
+++ b/src/common/windows/pdb_source_line_writer.cc
@@ -343,8 +343,10 @@ void PDBSourceLineWriter::Lines::AddLine(const Line& line) {
   do {
     auto iter = line_map_.lower_bound(line.rva);
     if (iter == line_map_.end()) {
-      --iter;
-      intercept(iter->second);
+      if (!line_map_.empty()) {
+        --iter;
+        intercept(iter->second);
+      }
       break;
     }
     is_intercept = false;
@@ -570,6 +572,10 @@ bool PDBSourceLineWriter::PrintSourceFiles() {
     return false;
   }
 
+  // Print a dummy file with id equals 0 to represent unknown file, because
+  // inline records might have unknown call site.
+  fwprintf(output_, L"FILE %d unknown file\n", 0);
+
   CComPtr<IDiaSymbol> compiland;
   ULONG count;
   while (SUCCEEDED(compilands->Next(1, &compiland, &count)) && count == 1) {