diff --git a/src/popupwin.c b/src/popupwin.c
index e1f73bd..47e9238 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -2484,6 +2484,8 @@
     void
 close_all_popups(void)
 {
+    if (ERROR_IF_POPUP_WINDOW)
+	return;
     while (first_popupwin != NULL)
 	popup_close(first_popupwin->w_id);
     while (curtab->tp_first_popupwin != NULL)
diff --git a/src/testdir/dumps/Test_popupwin_previewpopup_10.dump b/src/testdir/dumps/Test_popupwin_previewpopup_10.dump
new file mode 100644
index 0000000..7003b43
--- /dev/null
+++ b/src/testdir/dumps/Test_popupwin_previewpopup_10.dump
@@ -0,0 +1,14 @@
+|o+0&#ffffff0|n|e| @71
+|#|i|n|c|l|u|d|e| |"|X|h|e|a|d|e|r|.|h|"| @54
+|t|h|r|e@1| @69
+|f|o|u|r| @70
+|f|i|v|e| @28|╔+0#0000001#ffd7ff255| |X|h|e|a|d|e|r|.|h| |═@28|X
+|s+0#0000000#ffffff0|i|x| @29|║+0#0000001#ffd7ff255|1+0#e000002&|0| +0#0000001&@36| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255
+|s+0#0000000#ffffff0|e|v|e|n| @27|║+0#0000001#ffd7ff255|s|e|a|r|c|h|e|d| |w|o|r|d| |i|s| |h|e|r|e| @17| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255
+|f+0#0000000#ffffff0|i|n|d| |t|h|e|w|o|r|d| |s|o|m|e|w|h|e|r|e| @10|║+0#0000001#ffd7ff255|1+0#e000002&|2| +0#0000001&@36| +0#0000000#0000001|║+0#0000001#ffd7ff255
+|n+0#0000000#ffffff0|i|n|e| @28|║+0#0000001#ffd7ff255|1+0#e000002&|3| +0#0000001&@36| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255
+|t+0#0000000#ffffff0|h|i|s| |i|s| |a|n|o|t|h|e|r| |w|o|r|d| @12|╚+0#0000001#ffd7ff255|═@39|⇲
+|v+0#0000000#ffffff0|e|r|y| |l|o|n|g| |l|i|n|e| |w|h|e|r|e| |t|h|e| |w|o|r|d| |i|s| |a|l|s|o| >a|n|o|t|h|e|r| @29
+|~+0#4040ff13&| @73
+|~| @73
+|E+0#ffffff16#e000002|9@1|4|:| |N|o|t| |a|l@1|o|w|e|d| |i|n| |a| |p|o|p|u|p| |w|i|n|d|o|w| +0#0000000#ffffff0@21|1@1|,|3|9| @8|A|l@1| 
diff --git a/src/testdir/dumps/Test_popupwin_previewpopup_9.dump b/src/testdir/dumps/Test_popupwin_previewpopup_9.dump
new file mode 100644
index 0000000..f555a00
--- /dev/null
+++ b/src/testdir/dumps/Test_popupwin_previewpopup_9.dump
@@ -0,0 +1,14 @@
+|o+0&#ffffff0|n|e| @71
+|#|i|n|c|l|u|d|e| |"|X|h|e|a|d|e|r|.|h|"| @54
+|t|h|r|e@1| @69
+|f|o|u|r| @70
+|f|i|v|e| @28|╔+0#0000001#ffd7ff255| |X|h|e|a|d|e|r|.|h| |═@28|X
+|s+0#0000000#ffffff0|i|x| @29|║+0#0000001#ffd7ff255|1+0#e000002&|0| +0#0000001&@36| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255
+|s+0#0000000#ffffff0|e|v|e|n| @27|║+0#0000001#ffd7ff255|s|e|a|r|c|h|e|d| |w|o|r|d| |i|s| |h|e|r|e| @17| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255
+|f+0#0000000#ffffff0|i|n|d| |t|h|e|w|o|r|d| |s|o|m|e|w|h|e|r|e| @10|║+0#0000001#ffd7ff255|1+0#e000002&|2| +0#0000001&@36| +0#0000000#0000001|║+0#0000001#ffd7ff255
+|n+0#0000000#ffffff0|i|n|e| @28|║+0#0000001#ffd7ff255|1+0#e000002&|3| +0#0000001&@36| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255
+|t+0#0000000#ffffff0|h|i|s| |i|s| |a|n|o|t|h|e|r| |w|o|r|d| @12|╚+0#0000001#ffd7ff255|═@39|⇲
+|v+0#0000000#ffffff0|e|r|y| |l|o|n|g| |l|i|n|e| |w|h|e|r|e| |t|h|e| |w|o|r|d| |i|s| |a|l|s|o| >a|n|o|t|h|e|r| @29
+|~+0#4040ff13&| @73
+|~| @73
+|E+0#ffffff16#e000002|3|6@1|:| |N|o|t| |a|l@1|o|w|e|d| |t|o| |e|n|t|e|r| |a| |p|o|p|u|p| |w|i|n|d|o|w| +0#0000000#ffffff0@15|1@1|,|3|9| @8|A|l@1| 
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 654501b..ebcc1f4 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -2804,6 +2804,12 @@
   call term_sendkeys(buf, ":\<CR>")
   call VerifyScreenDump(buf, 'Test_popupwin_previewpopup_8', {})
 
+  call term_sendkeys(buf, "\<C-W>p")
+  call VerifyScreenDump(buf, 'Test_popupwin_previewpopup_9', {})
+
+  call term_sendkeys(buf, ":call win_execute(popup_findpreview(), 'call popup_clear()')\<CR>")
+  call VerifyScreenDump(buf, 'Test_popupwin_previewpopup_10', {})
+
   call StopVimInTerminal(buf)
   call delete('Xtags')
   call delete('Xtagfile')
diff --git a/src/version.c b/src/version.c
index 3f4eb80..e4600ce 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    142,
+/**/
     141,
 /**/
     140,
diff --git a/src/window.c b/src/window.c
index 0c3c7f6..6672433 100644
--- a/src/window.c
+++ b/src/window.c
@@ -4343,8 +4343,15 @@
     win_T	*owp = curwin;
 #endif
 
+#ifdef FEAT_PROP_POPUP
     if (ERROR_IF_POPUP_WINDOW)
 	return;
+    if (popup_is_popup(wp))
+    {
+	emsg(_("E366: Not allowed to enter a popup window"));
+	return;
+    }
+#endif
     if (text_locked())
     {
 	beep_flush();