diff --git a/clang/lib/AST/Interp/Context.h b/clang/lib/AST/Interp/Context.h
index c7620921e467e..dbb63e3691816 100644
--- a/clang/lib/AST/Interp/Context.h
+++ b/clang/lib/AST/Interp/Context.h
@@ -75,6 +75,7 @@ class Context final {
 
   /// Classifies an expression.
   std::optional<PrimType> classify(const Expr *E) const {
+    assert(E);
     if (E->isGLValue()) {
       if (E->getType()->isFunctionType())
         return PT_FnPtr;