Index: ELF/Driver.cpp
===================================================================
--- ELF/Driver.cpp
+++ ELF/Driver.cpp
@@ -440,6 +440,11 @@
   if (errorCount())
     return;
 
+  // The Target instance handles target-specific stuff, such as applying
+  // relocations or writing a PLT section. It also contains target-dependent
+  // values such as a default image base address.
+  Target = getTarget();
+
   switch (Config->EKind) {
   case ELF32LEKind:
     link<ELF32LE>(Args);
@@ -1616,11 +1621,6 @@
   if (Config->Strip != StripPolicy::None)
     llvm::erase_if(InputSections, [](InputSectionBase *S) { return S->Debug; });
 
-  // The Target instance handles target-specific stuff, such as applying
-  // relocations or writing a PLT section. It also contains target-dependent
-  // values such as a default image base address.
-  Target = getTarget();
-
   Config->EFlags = Target->calcEFlags();
   Config->MaxPageSize = getMaxPageSize(Args);
   Config->ImageBase = getImageBase(Args);
Index: test/ELF/undef-broken-debug.test
===================================================================
--- test/ELF/undef-broken-debug.test
+++ test/ELF/undef-broken-debug.test
@@ -8,6 +8,10 @@
 # CHECK: error: {{.*}}.o: relocation R_X86_64_64 at 0x29 has unsupported target
 # CHECK: error: undefined symbol: bar
 
+# We used to dereference null Target in DWARF.cpp:findAux while reporting a duplicate symbol error,
+# because Target wasn't initialized yet.
+# RUN: not ld.lld %t.o %t.o -o /dev/null
+
 --- !ELF
 FileHeader:
   Class:           ELFCLASS64