diff --git a/ChangeLog b/ChangeLog
index 8e90f5b78..da6a6709a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2001-04-06  Sven Wischnowsky  <wischnow@zsh.org>
 
+	* 13917: Src/params.c: test for unset in pipestatussetfn()
+
 	* 13916: Src/params.c: like 13907, but for backward searches
 
 2001-04-05 Felix Rosencrantz <f_rosencrantz@yahoo.com>
diff --git a/Src/params.c b/Src/params.c
index 2475f2861..3bca12bd8 100644
--- a/Src/params.c
+++ b/Src/params.c
@@ -2873,11 +2873,15 @@ pipestatgetfn(Param pm)
 static void
 pipestatsetfn(Param pm, char **x)
 {
-    int i;
+    if (x) {
+        int i;
 
-    for (i = 0; *x && i < MAX_PIPESTATS; i++, x++)
-	pipestats[i] = atoi(*x);
-    numpipestats = i;
+        for (i = 0; *x && i < MAX_PIPESTATS; i++, x++)
+            pipestats[i] = atoi(*x);
+            numpipestats = i;
+    }
+    else
+        numpipestats = 0;
 }
 
 /**/