diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -369,6 +369,8 @@
   (`#62207 <https://github.com/llvm/llvm-project/issues/62207>`_)
 - Fix lambdas and other anonymous function names not respecting ``-fdebug-prefix-map``
   (`#62192 <https://github.com/llvm/llvm-project/issues/62192>`_)
+- 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
@@ -2579,7 +2579,13 @@
       T = Context.getIncompleteArrayType(T, ASM, Quals);
     }
   } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
-    T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
+    if (getLangOpts().CPlusPlus) {
+      T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals,
+                                             Brackets);
+    } else {
+      // DependentSizedArrayType cannot be handled by C
+      T = Context.getConstantArrayType(T, ConstVal, ArraySize, ASM, Quals);
+    }
   } else {
     ExprResult R =
         checkArraySize(*this, ArraySize, ConstVal, VLADiag, 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}}