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-rw-r--r--innobase/dict/dict0dict.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/innobase/dict/dict0dict.c b/innobase/dict/dict0dict.c
index ba03e1f5e41..df48a8a4b5a 100644
--- a/innobase/dict/dict0dict.c
+++ b/innobase/dict/dict0dict.c
@@ -28,7 +28,7 @@ Created 1/8/1996 Heikki Tuuri
#include "rem0cmp.h"
/* Implement isspace() in a locale-independent way. (Bug #24299) */
-#define ib_isspace(c) strchr(" \v\f\t\r\n", c)
+#define ib_isspace(c) ((char) (c) && strchr(" \v\f\t\r\n", c))
dict_sys_t* dict_sys = NULL; /* the dictionary system */