diff --git a/src/quickfix.c b/src/quickfix.c
index dd681ca..3e2d3df 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -4829,8 +4829,18 @@
 	}
 
 	// delete all existing lines
+	//
+	// Note: we cannot store undo information, because
+	// qf buffer is usually not allowed to be modified.
+	//
+	// So we need to clean up undo information
+	// otherwise autocommands may invalidate the undo stack
 	while ((curbuf->b_ml.ml_flags & ML_EMPTY) == 0)
 	    (void)ml_delete((linenr_T)1);
+
+	// Remove all undo information
+	u_blockfree(curbuf);
+	u_clearall(curbuf);
     }
 
     // Check if there is anything to display
diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 6e12232..90dc3c1 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -4413,4 +4413,32 @@
   delfunc SetupVimTest_shm
 endfunc
 
+func Test_autocmd_invalidates_undo_on_textchanged()
+  CheckRunVimInTerminal
+  let script =<< trim END
+    set hidden
+    " create quickfix list (at least 2 lines to move line)
+    vimgrep /u/j %
+
+    " enter quickfix window
+    cwindow
+
+    " set modifiable
+    setlocal modifiable
+
+    " set autocmd to clear quickfix list
+
+    autocmd! TextChanged <buffer> call setqflist([])
+    " move line
+    move+1
+  END
+  call writefile(script, 'XTest_autocmd_invalidates_undo_on_textchanged', 'D')
+  let buf = RunVimInTerminal('XTest_autocmd_invalidates_undo_on_textchanged', {'rows': 20})
+  call term_sendkeys(buf, ":so %\<cr>")
+  call term_sendkeys(buf, "G")
+  call WaitForAssert({-> assert_match('^XTest_autocmd_invalidates_undo_on_textchanged\s*$', term_getline(buf, 20))}, 1000)
+
+  call StopVimInTerminal(buf)
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 72495c2..d23c9ce 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    112,
+/**/
     111,
 /**/
     110,