From snapshot 6.1-20191012

diff --git a/progs/dump_entry.c b/progs/dump_entry.c
index d0e420ec..8a47084a 100644
--- a/progs/dump_entry.c
+++ b/progs/dump_entry.c
@@ -1136,7 +1136,8 @@ fmt_entry(TERMTYPE2 *tterm,
 				*d++ = '\\';
 				*d = ':';
 			    } else if (*d == '\\') {
-				*++d = *s++;
+				if ((*++d = *s++) == '\0')
+				    break;
 			    }
 			    d++;
 			    *d = '\0';