Index: openacs-4/packages/boomerang/tcl/boomerang-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/boomerang/tcl/boomerang-procs.tcl,v
diff -u -r1.13.2.9 -r1.13.2.10
--- openacs-4/packages/boomerang/tcl/boomerang-procs.tcl	9 Aug 2019 21:11:40 -0000	1.13.2.9
+++ openacs-4/packages/boomerang/tcl/boomerang-procs.tcl	12 Oct 2019 10:20:39 -0000	1.13.2.10
@@ -183,7 +183,11 @@
                     dict set entries nt_tcp_time [expr {[dict get $entries nt_con_end] - [dict get $entries nt_con_st]}]
                     dict set entries nt_request_time [expr {[dict get $entries nt_res_st] - [dict get $entries nt_req_st]}]
                     dict set entries nt_response_time [expr {[dict get $entries nt_res_end] - [dict get $entries nt_res_st]}]
-                    dict set entries nt_processing_time [expr {[dict get $entries nt_domcomp] - [dict get $entries nt_res_end]}]
+                    if {![dict get $entries nt_domcomp]} {
+                        dict set entries nt_processing_time 0
+                    } else {
+                        dict set entries nt_processing_time [expr {[dict get $entries nt_domcomp] - [dict get $entries nt_res_end]}]
+                    }
                     dict set entries nt_total_time [expr {[dict get $entries nt_load_end] - [dict get $entries nt_nav_st]}]
 
                     #