here is the patch

best regards
diff --git a/src/fr-command-7z.c b/src/fr-command-7z.c
index 297ba1b..0b784f7 100644
--- a/src/fr-command-7z.c
+++ b/src/fr-command-7z.c
@@ -106,7 +106,7 @@ list__process_line (char     *line,
 			strncpy (version, ver_start, ver_len);
 			version[ver_len] = 0;
 
-			if (strcmp (version, "4.55") < 0)
+			if ((strcmp (version, "4.55") < 0) && (ver_len > 1) && (version[1] == '.'))
 				p7z_comm->old_style = TRUE;
 			else
 				p7z_comm->old_style = FALSE;

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