commit 23b52c3: [Minor] Fix one more corner case

[Vsevolod Stakhov]

Author: Vsevolod Stakhov
Date: 2021-07-21 15:13:27 +0100
URL: https://github.com/rspamd/rspamd/commit/23b52c3eb70ba4a81d0eb84e7a1b4812027f1035 (HEAD -> master)

[Minor] Fix one more corner case

---
 src/libserver/html/html.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/libserver/html/html.cxx b/src/libserver/html/html.cxx
index d60210ba6..6cf3b959d 100644
--- a/src/libserver/html/html.cxx
+++ b/src/libserver/html/html.cxx
@@ -1191,9 +1191,10 @@ html_append_tag_content(rspamd_mempool_t *pool,
 					/* Add a space */
 					hc->parsed += ' ';
 				}
+
 				hc->parsed.append(maybe_alt.value());
 
-				if (!g_ascii_isspace (hc->parsed.back())) {
+				if (!hc->parsed.empty() && !g_ascii_isspace (hc->parsed.back())) {
 					/* Add a space */
 					hc->parsed += ' ';
 				}