Index: clang/lib/Sema/SemaInit.cpp
===================================================================
--- clang/lib/Sema/SemaInit.cpp
+++ clang/lib/Sema/SemaInit.cpp
@@ -5936,6 +5936,7 @@
   // We're at the end of the line for C: it's either a write-back conversion
   // or it's a C assignment. There's no need to check anything else.
   if (!S.getLangOpts().CPlusPlus) {
+    assert(Initializer && "Intializer must be non-null");
     // If allowed, check whether this is an Objective-C writeback conversion.
     if (allowObjCWritebackConversion &&
         tryObjCWritebackConversion(S, *this, Entity, Initializer)) {
@@ -5955,6 +5956,7 @@
 
   //     - If the destination type is a (possibly cv-qualified) class type:
   if (DestType->isRecordType()) {
+    assert(Initializer && "Intializer must be non-null");
     //     - If the initialization is direct-initialization, or if it is
     //       copy-initialization where the cv-unqualified version of the
     //       source type is the same class as, or a derived class of, the
@@ -6022,6 +6024,7 @@
   //    - Otherwise, if the source type is a (possibly cv-qualified) class
   //      type, conversion functions are considered.
   if (!SourceType.isNull() && SourceType->isRecordType()) {
+    assert(Initializer && "Intializer must be non-null");
     // For a conversion to _Atomic(T) from either T or a class type derived
     // from T, initialize the T object then convert to _Atomic type.
     bool NeedAtomicConversion = false;