updated for version 7.3.588
Problem:    Crash on NULL pointer.
Solution:   Fix the immediate problem by checking for NULL. (Lech Lorens)
diff --git a/src/version.c b/src/version.c
index 1314e41..2676fa7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    588,
+/**/
     587,
 /**/
     586,