Index: tools/dsymutil/DwarfLinker.cpp

===================================================================

--- a/llvm/tools/dsymutil/DwarfLinker.cpp	(revision 313871)

+++ b/llvm/tools/dsymutil/DwarfLinker.cpp	(revision 313872)

@@ -1496,7 +1496,11 @@

   if ((RefCU = getUnitForOffset(Units, RefOffset)))

-    if (const auto RefDie = RefCU->getOrigUnit().getDIEForOffset(RefOffset))

-      return RefDie;

+    if (const auto RefDie = RefCU->getOrigUnit().getDIEForOffset(RefOffset)) {

+      // In a file with broken references, an attribute might point to a NULL

+      // DIE.

+      if(!RefDie.isNULL())

+        return RefDie;

+    }

   Linker.reportWarning("could not find referenced DIE", &DIE);

   return DWARFDie();