diff --git a/clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp b/clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp
--- a/clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp
+++ b/clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp
@@ -623,6 +623,9 @@
 }
 
 bool ExtractFunction::prepare(const Selection &Inputs) {
+  // Don't trigger the tweak on an empty selection.
+  if (Inputs.SelectionBegin == Inputs.SelectionEnd)
+    return false;
   const Node *CommonAnc = Inputs.ASTSelection.commonAncestor();
   const SourceManager &SM = Inputs.AST.getSourceManager();
   const LangOptions &LangOpts = Inputs.AST.getASTContext().getLangOpts();
diff --git a/clang-tools-extra/clangd/unittests/TweakTests.cpp b/clang-tools-extra/clangd/unittests/TweakTests.cpp
--- a/clang-tools-extra/clangd/unittests/TweakTests.cpp
+++ b/clang-tools-extra/clangd/unittests/TweakTests.cpp
@@ -540,6 +540,8 @@
   EXPECT_EQ(apply("int x = 0; [[x++;]]"), "unavailable");
   // We don't support extraction from lambdas.
   EXPECT_EQ(apply("auto lam = [](){ [[int x;]] }; "), "unavailable");
+  // no selection.
+  EXPECT_EQ(apply("int ^x;"), "unavailable");
 
   // Ensure that end of Zone and Beginning of PostZone being adjacent doesn't
   // lead to break being included in the extraction zone.