diff --git a/winsup/cygwin/external.cc b/winsup/cygwin/external.cc
index c81bdc0fa..6aae32aea 100644
--- a/winsup/cygwin/external.cc
+++ b/winsup/cygwin/external.cc
@@ -339,7 +339,7 @@ cygwin_internal (cygwin_getinfo_types t, ...)
 	  size_t n;
 	  pid_t pid = va_arg (arg, pid_t);
 	  pinfo p (pid);
-	  res = (uintptr_t) p->cmdline (n);
+	  res = (uintptr_t) (p ? p->cmdline (n) : NULL);
 	}
 	break;
       case CW_CHECK_NTSEC:
diff --git a/winsup/cygwin/fhandler_process.cc b/winsup/cygwin/fhandler_process.cc
index 453e79b16..7f122fbe4 100644
--- a/winsup/cygwin/fhandler_process.cc
+++ b/winsup/cygwin/fhandler_process.cc
@@ -518,7 +518,7 @@ format_process_cmdline (void *data, char *&destbuf)
       cfree (destbuf);
       destbuf = NULL;
     }
-  destbuf = p->cmdline (fs);
+  destbuf = p ? p->cmdline (fs) : NULL;
   if (!destbuf || !*destbuf)
     {
       destbuf = cstrdup ("<defunct>");
diff --git a/winsup/cygwin/pinfo.cc b/winsup/cygwin/pinfo.cc
index c28158168..e792a0a1c 100644
--- a/winsup/cygwin/pinfo.cc
+++ b/winsup/cygwin/pinfo.cc
@@ -976,7 +976,7 @@ char *
 _pinfo::cmdline (size_t& n)
 {
   char *s = NULL;
-  if (!this || !pid)
+  if (!pid)
     return NULL;
   if (ISSTATE (this, PID_NOTCYGWIN))
     {