diff --git a/clang/lib/Analysis/FlowSensitive/Transfer.cpp b/clang/lib/Analysis/FlowSensitive/Transfer.cpp
--- a/clang/lib/Analysis/FlowSensitive/Transfer.cpp
+++ b/clang/lib/Analysis/FlowSensitive/Transfer.cpp
@@ -279,7 +279,10 @@
 
   void VisitCXXThisExpr(const CXXThisExpr *S) {
     auto *ThisPointeeLoc = Env.getThisPointeeStorageLocation();
-    assert(ThisPointeeLoc != nullptr);
+    if (ThisPointeeLoc == nullptr)
+      // Unions are not supported yet, and will not have a location for the
+      // `this` expression's pointee.
+      return;
 
     auto &Loc = Env.createStorageLocation(*S);
     Env.setStorageLocation(*S, Loc);
diff --git a/clang/unittests/Analysis/FlowSensitive/TransferTest.cpp b/clang/unittests/Analysis/FlowSensitive/TransferTest.cpp
--- a/clang/unittests/Analysis/FlowSensitive/TransferTest.cpp
+++ b/clang/unittests/Analysis/FlowSensitive/TransferTest.cpp
@@ -42,10 +42,11 @@
   template <typename Matcher>
   void runDataflow(llvm::StringRef Code, Matcher Match,
                    LangStandard::Kind Std = LangStandard::lang_cxx17,
-                   bool ApplyBuiltinTransfer = true) {
+                   bool ApplyBuiltinTransfer = true,
+                   llvm::StringRef TargetFun = "target") {
     ASSERT_THAT_ERROR(
         test::checkDataflow<NoopAnalysis>(
-            Code, "target",
+            Code, TargetFun,
             [ApplyBuiltinTransfer](ASTContext &C, Environment &) {
               return NoopAnalysis(C, ApplyBuiltinTransfer);
             },
@@ -3175,4 +3176,27 @@
 });
 }
 
+TEST_F(TransferTest, DoesNotCrashOnUnionThisExpr) {
+  std::string Code = R"(
+    union Union {
+      int A;
+      float B;
+    };
+
+    void foo() {
+      Union A;
+      Union B;
+      A = B;
+    }
+  )";
+  // This is a crash regression test when calling the transfer function on a
+  // `CXXThisExpr` that refers to a union.
+  runDataflow(
+      Code,
+      [](llvm::ArrayRef<
+             std::pair<std::string, DataflowAnalysisState<NoopLattice>>>,
+         ASTContext &) {},
+      LangStandard::lang_cxx17, /*ApplyBuiltinTransfer=*/true, "operator=");
+}
+
 } // namespace