diff -Naur commons.orig/drupal-org.make commons/drupal-org.make
--- commons.orig/drupal-org.make	2017-08-30 21:45:23.000000000 +0200
+++ commons/drupal-org.make	2017-08-30 22:13:43.000000000 +0200
@@ -161,6 +161,10 @@
 projects[flag][subdir] = "contrib"
 projects[flag][version] = "3.9"

+; Fix Fatal error: Unsupported operand types in flag_flag.inc on line 132
+; https://www.drupal.org/node/2347297
+projects[flag][patch][] = "patches/0001-commons-flag-fix-unsupported-operands.patch"
+
 projects[flag_abuse][type] = "module"
 projects[flag_abuse][subdir] = "contrib"
 projects[flag_abuse][version] = "2.0"
diff -Naur commons.orig/patches/0001-commons-flag-fix-unsupported-operands.patch commons/patches/0001-commons-flag-fix-unsupported-operands.patch
--- commons.orig/patches/0001-commons-flag-fix-unsupported-operands.patch	1970-01-01 01:00:00.000000000 +0100
+++ commons/patches/0001-commons-flag-fix-unsupported-operands.patch	2017-08-30 22:12:48.000000000 +0200
@@ -0,0 +1,12 @@
+diff -Naur a/includes/flag/flag_flag.inc b/includes/flag/flag_flag.inc
+--- a/includes/flag/flag_flag.inc	2017-08-30 21:45:26.000000000 +0200
++++ b/includes/flag/flag_flag.inc	2017-08-30 21:48:09.000000000 +0200
+@@ -129,7 +129,7 @@
+
+     // Populate the options with the defaults.
+     $options = (array) unserialize($row->options);
+-    $options += $flag->options();
++    $options = array_merge($options, $flag->options());
+
+     // Make the unserialized options accessible as normal properties.
+     foreach ($options as $option => $value) {