diff --git a/llvm/test/tools/llvm-exegesis/lit.local.cfg b/llvm/test/tools/llvm-exegesis/lit.local.cfg
--- a/llvm/test/tools/llvm-exegesis/lit.local.cfg
+++ b/llvm/test/tools/llvm-exegesis/lit.local.cfg
@@ -14,6 +14,9 @@
     # only know that at runtime, so we try to measure an empty code snippet
     # and bail out on error.
     llvm_exegesis_exe = lit.util.which('llvm-exegesis', config.llvm_tools_dir)
+    if llvm_exegesis_exe is None:
+       print('could not find llvm-exegesis')
+       return False
     try:
         return_code = subprocess.call(
             [llvm_exegesis_exe, '-mode', mode, '-snippets-file', '/dev/null'] + extra_options,