diff --git a/src/lint/linter/ArcanistXHPASTLinter.php b/src/lint/linter/ArcanistXHPASTLinter.php
index 1b65f6cf..b005ea48 100644
--- a/src/lint/linter/ArcanistXHPASTLinter.php
+++ b/src/lint/linter/ArcanistXHPASTLinter.php
@@ -426,7 +426,7 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
           }
 
           $span = $conditional
-            ->getChildOfType(1, 'n_STATEMENT_LIST')
+            ->getChildByIndex(1)
             ->getTokens();
 
           $whitelist[$type][$symbol_name][] = range(
diff --git a/src/lint/linter/__tests__/xhpast/conditional-usage.lint-test b/src/lint/linter/__tests__/xhpast/conditional-usage.lint-test
index 32dc71d9..2c98f060 100644
--- a/src/lint/linter/__tests__/xhpast/conditional-usage.lint-test
+++ b/src/lint/linter/__tests__/xhpast/conditional-usage.lint-test
@@ -12,6 +12,9 @@ if (class_exists('CURLFile')) {
   new DateTimeImmutable();
 }
 
+if (function_exists('json_last_error_msg'))
+  json_last_error_msg();
+
 // These shouldn't fatal.
 if (SomeClass::someStaticMethod($param)) {}
 $var = 'some_func';