diff --git a/src/lint/linter/xhpast/rules/ArcanistCurlyBraceArrayIndexXHPASTLinterRule.php b/src/lint/linter/xhpast/rules/ArcanistCurlyBraceArrayIndexXHPASTLinterRule.php
index 2d2fa171..99b3ab94 100644
--- a/src/lint/linter/xhpast/rules/ArcanistCurlyBraceArrayIndexXHPASTLinterRule.php
+++ b/src/lint/linter/xhpast/rules/ArcanistCurlyBraceArrayIndexXHPASTLinterRule.php
@@ -19,6 +19,10 @@ final class ArcanistCurlyBraceArrayIndexXHPASTLinterRule
     foreach ($index_accesses as $index_access) {
       $tokens = $index_access->getChildByIndex(1)->getTokens();
 
+      if (!$tokens) {
+        continue;
+      }
+
       $left_brace = head($tokens)->getPrevToken();
       while (!$left_brace->isSemantic()) {
         $left_brace = $left_brace->getPrevToken();
diff --git a/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/array_push.lint-test b/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/array_push.lint-test
new file mode 100644
index 00000000..266b2844
--- /dev/null
+++ b/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/array_push.lint-test
@@ -0,0 +1,3 @@
+<?php
+$x[] = 'value';
+~~~~~~~~~~