Account for null strinng in debug "show"

diff --git a/src/src/exim.c b/src/src/exim.c
index 9da921a5c13c833970a0685a94c58e4a004eec5f..38ce2b46f1a6d60873066cab15a558bf6101b898 100644 (file)
--- a/src/src/exim.c
+++ b/src/src/exim.c
@@ -958,8 +958,9 @@ void
 show_string(BOOL is_stdout, gstring * g)
 {
 const uschar * s = string_from_gstring(g);
-if (is_stdout) fputs(CCS s, stdout);
-else debug_printf("%s", s);
+if (s)
+  if (is_stdout) fputs(CCS s, stdout);
+  else debug_printf("%s", s);
 }