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In function getGoogleChartParams of CooperationStatistics_body.php

===================================================================
--- CooperationStatistics_body.php      (revision 54255)
+++ CooperationStatistics_body.php      (working copy)
@@ -63,6 +63,7 @@
                        'chs' => $wgCoopStatsChartDimensions,
                        'cht' => 'p3',
                        'chd' => 't:' . implode( ',', $stats ),
+                       'chds' => '0,' . max( $stats ),
                        'chl' => implode( wfMsg( 'word-separator' ) . wfMsg( 'cooperationstatistics-users' ) . ' |', array_keys( $stats ) ) . wfMsg( 'word-separator' ) . wfMsg( 'cooperationstatistics-legendmore' )
                ) );
        }