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-rw-r--r--src/xdisp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/xdisp.c b/src/xdisp.c
index 55d1272faaf..d42862b190a 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -10636,6 +10636,7 @@ set_message (const char *s, Lisp_Object string,
help_echo_showing_p = 0;
if (STRINGP (Vdebug_on_message)
+ && STRINGP (string)
&& fast_string_match (Vdebug_on_message, string) >= 0)
call_debugger (list2 (Qerror, string));
}