diff --git a/src/utils/utf8.php b/src/utils/utf8.php
--- a/src/utils/utf8.php
+++ b/src/utils/utf8.php
@@ -314,6 +314,8 @@
  * @return  int     The console display length of the string.
  */
 function phutil_utf8_console_strlen($string) {
+  $string = phutil_string_cast($string);
+
   // Formatting and colors don't contribute any width in the console.
   $string = preg_replace("/\x1B\[\d*m/", '', $string);