diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
index 8b9c0e2cc7d5..e3bb944917c9 100644
--- a/clang/lib/Sema/SemaExprCXX.cpp
+++ b/clang/lib/Sema/SemaExprCXX.cpp
@@ -3656,6 +3656,11 @@ static bool evaluateTypeTrait(Sema &S, TypeTrait Kind, SourceLocation KWLoc,
     if (Args[0]->getType()->isIncompleteType())
       return false;
 
+    // Make sure the first argument is not an abstract type.
+    CXXRecordDecl *RD = Args[0]->getType()->getAsCXXRecordDecl();
+    if (RD && RD->isAbstract())
+      return false;
+
     SmallVector<OpaqueValueExpr, 2> OpaqueArgExprs;
     SmallVector<Expr *, 2> ArgExprs;
     ArgExprs.reserve(Args.size() - 1);
diff --git a/clang/test/SemaCXX/type-traits.cpp b/clang/test/SemaCXX/type-traits.cpp
index 28fb8dc749fd..3b94ef0951eb 100644
--- a/clang/test/SemaCXX/type-traits.cpp
+++ b/clang/test/SemaCXX/type-traits.cpp
@@ -1964,6 +1964,10 @@ void constructible_checks() {
 
   { int arr[T(__is_constructible(NonPOD, int))]; }
   { int arr[F(__is_nothrow_constructible(NonPOD, int))]; }
+
+  // PR19178
+  { int arr[F(__is_constructible(Abstract))]; }
+  { int arr[F(__is_nothrow_constructible(Abstract))]; }
 }
 
 // Instantiation of __is_trivially_constructible
@@ -1991,6 +1995,7 @@ void is_trivially_constructible_test() {
   { int arr[F((is_trivially_constructible<int, int*>::value))]; }
   { int arr[F((is_trivially_constructible<NonTrivialDefault>::value))]; }
   { int arr[F((is_trivially_constructible<ThreeArgCtor, int*, char*, int&>::value))]; }
+  { int arr[F((is_trivially_constructible<Abstract>::value))]; } // PR19178
 }
 
 void array_rank() {