diff --git a/cluster/apt.apply.update.sh b/cluster/apt.apply.update.sh
index 378e803..28ed3a4 100755
--- a/cluster/apt.apply.update.sh
+++ b/cluster/apt.apply.update.sh
@@ -69,6 +69,7 @@ debug_message() {                                               # {{{
 	## Print message if DEBUG is enable (=0)
 	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME}: ${local_message}"
 
+	return 0
 }
 # }}}
 is_apt_upgrade_absent() {                                       # {{{
diff --git a/cluster/apt.check.update.sh b/cluster/apt.check.update.sh
index 20797f2..41be2d9 100755
--- a/cluster/apt.check.update.sh
+++ b/cluster/apt.check.update.sh
@@ -64,6 +64,7 @@ debug_message() {                                               # {{{
 	## Print message if DEBUG is enable (=0)
 	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_message}"
 
+	return 0
 }
 # }}}
 is_apt_upgrade_absent() {                                       # {{{
diff --git a/cluster/maco.apply.update.sh b/cluster/maco.apply.update.sh
index 90ebfe9..39855d7 100755
--- a/cluster/maco.apply.update.sh
+++ b/cluster/maco.apply.update.sh
@@ -70,6 +70,7 @@ debug_message() {                                               # {{{
 	## Print message if DEBUG is enable (=0)
 	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME}: ${local_message}"
 
+	return 0
 }
 # }}}
 is_apt_upgrade_present() {                                      # {{{
diff --git a/cluster/maco.check.update.sh b/cluster/maco.check.update.sh
index 37563bf..55d5c22 100755
--- a/cluster/maco.check.update.sh
+++ b/cluster/maco.check.update.sh
@@ -76,6 +76,7 @@ debug_message() {                                               # {{{
 	## Print message if DEBUG is enable (=0)
 	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME}: ${local_debug_message}"
 
+	return 0
 }
 # }}}
 message() {                                                     # {{{
diff --git a/cluster/maco.remove.jobs.sh b/cluster/maco.remove.jobs.sh
index d982d8c..68072bc 100755
--- a/cluster/maco.remove.jobs.sh
+++ b/cluster/maco.remove.jobs.sh
@@ -42,6 +42,7 @@ debug_message() {                                               # {{{
 	## Print message if DEBUG is enable (=0)
 	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME}: ${local_message}"
 
+	return 0
 }
 # }}}
 is_proc_running() {                                             # {{{
diff --git a/cluster/sge.disable.host.queue.sh b/cluster/sge.disable.host.queue.sh
index a07f53d..8e0daba 100755
--- a/cluster/sge.disable.host.queue.sh
+++ b/cluster/sge.disable.host.queue.sh
@@ -51,6 +51,7 @@ debug_message() {                                               # {{{
 	## Print message if DEBUG is enable (=0)
 	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
 
+	return 0
 }
 # }}}
 define_vars() {                                                 # {{{
diff --git a/cluster/sge.enable.host.queue.sh b/cluster/sge.enable.host.queue.sh
index ef50d0e..3ea951a 100755
--- a/cluster/sge.enable.host.queue.sh
+++ b/cluster/sge.enable.host.queue.sh
@@ -71,6 +71,7 @@ debug_message() {                                               # {{{
 	## Print message if DEBUG is enable (=0)
 	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
 
+	return 0
 }
 # }}}
 message() {                                                     # {{{