diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index d114fed..90fd015 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -1820,7 +1820,7 @@
 	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK|EX_NONWHITE_OK,
 	ADDR_LINES),
 EXCMD(CMD_block,	"{",		ex_block,  // not found normally
-	0,
+	EX_TRLBAR,
 	ADDR_NONE),
 EXCMD(CMD_endblock,	"}",		ex_endblock,
 	EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
diff --git a/src/ex_eval.c b/src/ex_eval.c
index ad9de26..f6f766a 100644
--- a/src/ex_eval.c
+++ b/src/ex_eval.c
@@ -912,7 +912,7 @@
 enter_block(cstack_T *cstack)
 {
     ++cstack->cs_idx;
-    if (in_vim9script())
+    if (in_vim9script() && current_sctx.sc_sid > 0)
     {
 	scriptitem_T *si = SCRIPT_ITEM(current_sctx.sc_sid);
 
diff --git a/src/version.c b/src/version.c
index dc6a16c..eece321 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2553,
+/**/
     2552,
 /**/
     2551,