diff --git a/src/lint/renderer/ArcanistConsoleLintRenderer.php b/src/lint/renderer/ArcanistConsoleLintRenderer.php
--- a/src/lint/renderer/ArcanistConsoleLintRenderer.php
+++ b/src/lint/renderer/ArcanistConsoleLintRenderer.php
@@ -122,6 +122,24 @@
     $old_impact = substr_count($original, "\n") + 1;
     $start = $line;
 
+    $max_old = count($old_lines);
+    if ($start > $max_old) {
+      // See PHI1782. If a linter raises a warning at a line that does not
+      // exist, just render a warning.
+
+      $line = $this->renderLine(
+        $start,
+        pht(
+          '(This message was raised at line %s, but the file only has '.
+          '%s line(s).)',
+          new PhutilNumber($start),
+          new PhutilNumber($max_old)),
+        false,
+        '?');
+
+      return $line."\n\n";
+    }
+
     if ($message->isPatchable()) {
       $patch_offset = $line_map[$line] + ($char - 1);