diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index b2fc968..a4d0f20 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -295,4 +295,10 @@
 
 endfunc
 
+function Test_helpgrep()
+  helpgrep quickfix
+  copen
+  " This wipes out the buffer, make sure that doesn't cause trouble.
+  cclose
+endfunc
 
diff --git a/src/version.c b/src/version.c
index 30e6068..845158b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1137,
+/**/
     1136,
 /**/
     1135,
diff --git a/src/window.c b/src/window.c
index 95515b5..408c4bd 100644
--- a/src/window.c
+++ b/src/window.c
@@ -2445,6 +2445,10 @@
 	if (win_valid(win))
 	    win->w_closing = FALSE;
 #endif
+	/* Make sure curbuf is valid. It can become invalid if 'bufhidden' is
+	 * "wipe". */
+	if (!buf_valid(curbuf))
+	    curbuf = firstbuf;
     }
 
     if (only_one_window() && win_valid(win) && win->w_buffer == NULL