diff --git a/src/vim9script.c b/src/vim9script.c
index e04c0f0..b9dc5d7 100644
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -564,6 +564,10 @@
     scriptitem_T    *si = SCRIPT_ITEM(current_sctx.sc_sid);
     int		    idx;
 
+    if (si->sn_version != SCRIPT_VERSION_VIM9)
+	// legacy script doesn't store variable types
+	return OK;
+
     // Find the svar_T in sn_var_vals.
     for (idx = 0; idx < si->sn_var_vals.ga_len; ++idx)
     {