diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 6b9b54a58..c181b203f 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1963,6 +1963,11 @@ def Test_expr7_lambda_block()
       assert_equal(['no', 'yes', 'no'], dll)
   END
   CheckDefAndScriptSuccess(lines)
+
+  lines =<< trim END
+      map([1, 2], (k, v) => { redrawt })
+  END
+  CheckDefAndScriptFailure(lines, 'E488')
 enddef
 
 def NewLambdaWithComments(): func
diff --git a/src/userfunc.c b/src/userfunc.c
index a53c4769c..c9c7bc791 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -954,10 +954,15 @@ lambda_function_body(
     int		lnum_save = -1;
     linenr_T	sourcing_lnum_top = SOURCING_LNUM;
 
+    if (!ends_excmd2(*arg, skipwhite(*arg + 1)))
+    {
+	semsg(_(e_trailing_arg), *arg + 1);
+	return FAIL;
+    }
+
     CLEAR_FIELD(eap);
     eap.cmdidx = CMD_block;
     eap.forceit = FALSE;
-    eap.arg = *arg + 1;
     eap.cmdlinep = &cmdline;
     eap.skip = !evaluate;
     if (evalarg->eval_cctx != NULL)
diff --git a/src/version.c b/src/version.c
index 3a5365a86..fbe38b806 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2642,
 /**/
     2641,
 /**/