diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
--- a/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
@@ -113,9 +113,11 @@
      << format("      line_range: %u\n", LineRange)
      << format("     opcode_base: %u\n", OpcodeBase);
 
+  const auto PrettyNullString = [](const char *S) { return S ? S : "(null)"; };
   for (uint32_t I = 0; I != StandardOpcodeLengths.size(); ++I)
     OS << format("standard_opcode_lengths[%s] = %u\n",
-                 LNStandardString(I + 1).data(), StandardOpcodeLengths[I]);
+                 PrettyNullString(LNStandardString(I + 1).data()),
+                 StandardOpcodeLengths[I]);
 
   if (!IncludeDirectories.empty()) {
     // DWARF v5 starts directory indexes at 0.