diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -303,6 +303,8 @@
 - Fix a failed assertion due to an invalid source location when trying to form
   a coverage report for an unresolved constructor expression.
   (`#62105 <https://github.com/llvm/llvm-project/issues/62105>`_)
+- Fix crash when member function contains invalid default argument.
+  (`#62122 <https://github.com/llvm/llvm-project/issues/62122>`_)
 
 Bug Fixes to Compiler Builtins
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -7383,6 +7383,7 @@
           SourceLocation ArgStartLoc = NextToken().getLocation();
           if (!ConsumeAndStoreInitializer(*DefArgToks, CIK_DefaultArgument)) {
             DefArgToks.reset();
+            Diag(ArgStartLoc, diag::err_expected) << "initializer";
             Actions.ActOnParamDefaultArgumentError(Param, EqualLoc);
           } else {
             Actions.ActOnParamUnparsedDefaultArgument(Param, EqualLoc,
diff --git a/clang/test/Parser/cxx-member-initializers.cpp b/clang/test/Parser/cxx-member-initializers.cpp
--- a/clang/test/Parser/cxx-member-initializers.cpp
+++ b/clang/test/Parser/cxx-member-initializers.cpp
@@ -108,4 +108,6 @@
   // expected-error@-2 {{type name requires a specifier or qualifier}}
   // expected-error@-3 {{expected '>'}}
   // expected-note@-4 {{to match this '<'}}
+
+  void n(int x = 1 ? 2) {} // expected-error {{expected initializer}}
 };