diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index d9e823a..4ff0fd7 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -114,6 +114,27 @@
       let var = v:true ? 1 :2
   END
   CheckScriptFailure(lines, 'E1004:', 2)
+
+  # check after failure eval_flags is reset
+  lines =<< trim END
+      vim9script
+      try
+        call eval('0 ? 1: 2')
+      catch
+      endtry
+      assert_equal(v:true, eval(string(v:true)))
+  END
+  CheckScriptSuccess(lines)
+
+  lines =<< trim END
+      vim9script
+      try
+        call eval('0 ? 1 :2')
+      catch
+      endtry
+      assert_equal(v:true, eval(string(v:true)))
+  END
+  CheckScriptSuccess(lines)
 enddef
 
 func Test_expr1_fails()
diff --git a/src/testdir/test_vimscript.vim b/src/testdir/test_vimscript.vim
index 9dd5fc7..f17e908 100644
--- a/src/testdir/test_vimscript.vim
+++ b/src/testdir/test_vimscript.vim
@@ -7445,6 +7445,30 @@
   call StopVimInTerminal(buf)
 endfunc
 
+" Test for issue6776              {{{1
+func Test_trinary_expression()
+  try
+    call eval('0 ? 0')
+  catch
+  endtry
+  " previous failure should not cause next expression to fail
+  call assert_equal(v:false, eval(string(v:false)))
+
+  try
+    call eval('0 ? "burp')
+  catch
+  endtry
+  " previous failure should not cause next expression to fail
+  call assert_equal(v:false, eval(string(v:false)))
+
+  try
+    call eval('1 ? 0 : "burp')
+  catch
+  endtry
+  " previous failure should not cause next expression to fail
+  call assert_equal(v:false, eval(string(v:false)))
+endfunction
+
 "-------------------------------------------------------------------------------
 " Modelines								    {{{1
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker