similar to https://www.gnu.org/software/gnutls/clang/report-NwyD8A.html

--- argp-standalone-1.3/argp-help.c	2003-12-11 14:07:05.000000000 +0530
+++ argp-standalone-1.3-patch/argp-help.c	2021-08-30 20:06:23.807999907 +0530
@@ -726,15 +726,20 @@
 canon_doc_option (const char **name)
 {
   int non_opt;
-  /* Skip initial whitespace.  */
-  while (isspace ( (unsigned char) **name))
-    (*name)++;
-  /* Decide whether this looks like an option (leading `-') or not.  */
-  non_opt = (**name != '-');
-  /* Skip until part of name used for sorting.  */
-  while (**name && !isalnum ( (unsigned char) **name))
-    (*name)++;
-  return non_opt;
+
+  if(!*name)
+    non_opt = 1;
+  else {
+    /* Skip initial whitespace.  */
+    while (isspace ( (unsigned char) **name))
+      (*name)++;
+    /* Decide whether this looks like an option (leading `-') or not.  */
+    non_opt = (**name != '-');
+    /* Skip until part of name used for sorting.  */
+    while (**name && !isalnum ( (unsigned char) **name))
+      (*name)++;
+    return non_opt;
+  }
 }
 
 /* Order ENTRY1 & ENTRY2 by the order which they should appear in a help