diff --git a/plugin/dashboard/block_evaluation_graph/block_evaluation_graph.class.php b/plugin/dashboard/block_evaluation_graph/block_evaluation_graph.class.php
index c9c23edf95..e71c8925b8 100755
--- a/plugin/dashboard/block_evaluation_graph/block_evaluation_graph.class.php
+++ b/plugin/dashboard/block_evaluation_graph/block_evaluation_graph.class.php
@@ -144,7 +144,7 @@ class BlockEvaluationGraph extends Block
 						$max = $min = $avg = array();
 						foreach ($evaluation_sumary as $evaluation) {
 							$max[] = $evaluation['max'];
-							$min[] = $evaluation['min'];
+							$min[] = !empty($evaluation['min'])?$evaluation['min']:0;
 							$avg[] = $evaluation['avg'];
 						}
 						// Dataset definition