diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -338,6 +338,8 @@
 - Fix crash when attempting to perform parenthesized initialization of an
   aggregate with a base class with only non-public constructors.
   (`#62296 <https://github.com/llvm/llvm-project/issues/62296>`_)
+- Fix crash when redefine variant with invalid type as another invalid type.
+  (`#62447 <https://github.com/llvm/llvm-project/issues/62447>`_)
 
 Bug Fixes to Compiler Builtins
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
--- a/clang/lib/Sema/SemaType.cpp
+++ b/clang/lib/Sema/SemaType.cpp
@@ -2546,6 +2546,9 @@
     return QualType();
   }
 
+  if (!getLangOpts().CPlusPlus && ArraySize && ArraySize->containsErrors())
+    return QualType();
+
   // VLAs always produce at least a -Wvla diagnostic, sometimes an error.
   unsigned VLADiag;
   bool VLAIsError;
diff --git a/clang/test/Sema/merge-decls.c b/clang/test/Sema/merge-decls.c
--- a/clang/test/Sema/merge-decls.c
+++ b/clang/test/Sema/merge-decls.c
@@ -91,3 +91,7 @@
   int x[5];
   test7_f(&x); // expected-warning {{incompatible pointer types passing 'int (*)[5]' to parameter of type 'int (*)[10]}}
 }
+
+char d;
+char x[sizeof(d.data) == 8]; // expected-error {{member reference base type 'char' is not a structure or union}}
+char x[sizeof(d.data) == 4]; // expected-error {{member reference base type 'char' is not a structure or union}}