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-rw-r--r--string.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/string.c b/string.c
index 1d3cdadc7cc..1b4a984ad35 100644
--- a/string.c
+++ b/string.c
@@ -429,6 +429,7 @@ str_concat(str1, str2)
#if 0
str2 = obj_as_string(str2);
#else
+ if (NIL_P(str2)) return str1;
Check_Type(str2, T_STRING);
#endif
str_cat(str1, RSTRING(str2)->ptr, RSTRING(str2)->len);