From 6278c9e7225e961601cb0a49c5136098e58930ec Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Wed, 5 Aug 2026 16:06:10 +0200
Subject: [PATCH] Improved error handling in case of faulty .lib line

---
 src/frontend/inpcom.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/frontend/inpcom.c b/src/frontend/inpcom.c
index 854c1b287..0ec7189aa 100644
--- a/src/frontend/inpcom.c
+++ b/src/frontend/inpcom.c
@@ -3969,8 +3969,13 @@ static struct card *expand_section_ref(struct card *c, const char *dir_name)
     s = skip_non_ws(line);
     while (isspace_c(*s))
         s++;
-    if (isquote(*s))
-        for (s_e = ++s; *s_e && !isquote(*s_e); s_e++) ;
+    if (isquote(*s)) {
+        for (s_e = ++s; *s_e && !isquote(*s_e); s_e++);
+        if (!*s_e) {
+            fprintf(stderr, "\nError: Missing second quote in line \n      %s", line);
+            controlled_exit(EXIT_FAILURE);
+        }
+    }
     else
         for (s_e = s; *s_e && !isspace_c(*s_e) && !isquote(*s_e); s_e++) ;
     y = s_e;