Avoid a segfault when reversing an empty array in-place.

1 files changed, 1 insertions, 1 deletions

diff --git a/pp.c b/pp.c
index 5876cfd607..daa63af9a4 100644
--- a/pp.c
+++ b/pp.c
@@ -5420,7 +5420,7 @@ PP(pp_reverse)
 		SV **begin = AvARRAY(av);
 		SV **end   = begin + AvFILLp(av);
 
-		while (begin < end) {
+		while (begin && begin < end) {
 		    register SV * const tmp = *begin;
 		    *begin++ = *end;
 		    *end--   = tmp;