1 files changed, 1 insertions, 0 deletions

diff --git a/src/bytecode.c b/src/bytecode.c
index f2394556e2b..363dcdfaa82 100644
--- a/src/bytecode.c
+++ b/src/bytecode.c
@@ -888,6 +888,7 @@ If the third argument is incorrect, Emacs may crash.")
 
         case Btemp_output_buffer_setup:
           BEFORE_POTENTIAL_GC ();
+          CHECK_STRING (TOP, 0);
           temp_output_buffer_setup (XSTRING (TOP)->data);
           AFTER_POTENTIAL_GC ();
           TOP = Vstandard_output;