diff --git a/lldb/test/API/tools/lldb-vscode/stackTraceMissingFunctionName/Makefile b/lldb/test/API/tools/lldb-vscode/stackTraceMissingFunctionName/Makefile
new file mode 100644
--- /dev/null
+++ b/lldb/test/API/tools/lldb-vscode/stackTraceMissingFunctionName/Makefile
@@ -0,0 +1,2 @@
+CXX_SOURCES := main.cpp
+include Makefile.rules
diff --git a/lldb/test/API/tools/lldb-vscode/stackTraceMissingFunctionName/TestVSCode_stackTraceMissingFunctionName.py b/lldb/test/API/tools/lldb-vscode/stackTraceMissingFunctionName/TestVSCode_stackTraceMissingFunctionName.py
new file mode 100644
--- /dev/null
+++ b/lldb/test/API/tools/lldb-vscode/stackTraceMissingFunctionName/TestVSCode_stackTraceMissingFunctionName.py
@@ -0,0 +1,26 @@
+"""
+Test lldb-vscode stack trace response
+"""
+
+
+import vscode
+from lldbsuite.test.decorators import *
+import os
+
+import lldbvscode_testcase
+from lldbsuite.test import lldbtest, lldbutil
+
+
+class TestVSCode_stackTraceMissingFunctionName(lldbvscode_testcase.VSCodeTestCaseBase):
+    @skipIfWindows
+    @skipIfRemote
+    def test_missingFunctionName(self):
+        """
+        Test that the stack frame without a function name is given its pc in the response.
+        """
+        program = self.getBuildArtifact("a.out")
+        self.build_and_launch(program)
+
+        self.continue_to_next_stop()
+        frame_without_function_name = self.get_stackFrames()[0]
+        self.assertEquals(frame_without_function_name["name"], "0x0000000000000000")
diff --git a/lldb/test/API/tools/lldb-vscode/stackTraceMissingFunctionName/main.cpp b/lldb/test/API/tools/lldb-vscode/stackTraceMissingFunctionName/main.cpp
new file mode 100644
--- /dev/null
+++ b/lldb/test/API/tools/lldb-vscode/stackTraceMissingFunctionName/main.cpp
@@ -0,0 +1,6 @@
+int main() {
+  typedef void (*FooCallback)();
+  FooCallback foo_callback = (FooCallback)0;
+  foo_callback(); // Crash at zero!
+  return 0;
+}
diff --git a/lldb/tools/lldb-vscode/JSONUtils.cpp b/lldb/tools/lldb-vscode/JSONUtils.cpp
--- a/lldb/tools/lldb-vscode/JSONUtils.cpp
+++ b/lldb/tools/lldb-vscode/JSONUtils.cpp
@@ -701,8 +701,12 @@
   const char *function_name = frame.GetDisplayFunctionName();
   std::string frame_name =
       function_name == nullptr ? std::string() : function_name;
-  if (frame_name.empty())
-    frame_name = "<unknown>";
+  if (frame_name.empty()) {
+    // If the function name is unavailable, display the pc address as a 16-digit
+    // hex string, e.g. "0x0000000000012345"
+    llvm::raw_string_ostream os(frame_name);
+    os << llvm::format_hex(frame.GetPC(), 18);
+  }
   bool is_optimized = frame.GetFunction().GetIsOptimized();
   if (is_optimized)
     frame_name += " [opt]";