1 files changed, 4 insertions, 1 deletions

diff --git a/libbb/last_char_is.c b/libbb/last_char_is.c
index a95e57c35..4e2ee92ed 100644
--- a/libbb/last_char_is.c
+++ b/libbb/last_char_is.c
@@ -28,7 +28,10 @@
  */
 char * last_char_is(const char *s, int c)
 {
-        char *sret  = (char *)s+strlen(s)-1;
+        char *sret;
+        if (!s)
+            return NULL;
+        sret  = (char *)s+strlen(s)-1;
         if (sret>=s && *sret == c) { 
                 return sret;
         } else {