diff --git a/htdocs/comm/action/peruser.php b/htdocs/comm/action/peruser.php
index 754cb736bc9..d4020f4df92 100644
--- a/htdocs/comm/action/peruser.php
+++ b/htdocs/comm/action/peruser.php
@@ -1186,33 +1186,34 @@ function show_day_events2($username, $day, $month, $year, $monthshown, $style, &
 			}
 		}
 
-		$ids1='';$ids2='';
-		if (count($cases1[$h]) && array_keys($cases1[$h])) $ids1=join(',', array_keys($cases1[$h]));
-		if (count($cases2[$h]) && array_keys($cases2[$h])) $ids2=join(',', array_keys($cases2[$h]));
+		$ids1='';
+        $ids2='';
+		if (is_array($cases1[$h]) && count($cases1[$h]) && array_keys($cases1[$h])) $ids1=join(',', array_keys($cases1[$h]));
+		if (is_array($cases2[$h]) && count($cases2[$h]) && array_keys($cases2[$h])) $ids2=join(',', array_keys($cases2[$h]));
 
 		if ($h == $begin_h) echo '<td class="'.$style.'_peruserleft cal_peruser'.($var?' cal_impair '.$style.'_impair':'').'">';
 		else echo '<td class="'.$style.' cal_peruser'.($var?' cal_impair '.$style.'_impair':'').'">';
-		if (count($cases1[$h]) == 1)	// only 1 event
+		if (is_array($cases1[$h]) && count($cases1[$h]) == 1)	// only 1 event
 		{
 			$output = array_slice($cases1[$h], 0, 1);
 			$title1=$langs->trans("Ref").' '.$ids1.($title1?' - '.$title1:'');
 			if ($output[0]['string']) $title1.=($title1?' - ':'').$output[0]['string'];
 			if ($output[0]['color']) $color1 = $output[0]['color'];
 		}
-		elseif (count($cases1[$h]) > 1)
+		elseif (is_array($cases1[$h]) && count($cases1[$h]) > 1)
 		{
 			$title1=$langs->trans("Ref").' '.$ids1.($title1?' - '.$title1:'');
 			$color1='222222';
 		}
 
-		if (count($cases2[$h]) == 1)	// only 1 event
+		if (is_array($cases2[$h]) && count($cases2[$h]) == 1)	// only 1 event
 		{
 			$output = array_slice($cases2[$h], 0, 1);
 			$title2=$langs->trans("Ref").' '.$ids2.($title2?' - '.$title2:'');
 			if ($output[0]['string']) $title2.=($title2?' - ':'').$output[0]['string'];
 			if ($output[0]['color']) $color2 = $output[0]['color'];
 		}
-		elseif (count($cases2[$h]) > 1)
+		elseif (is_array($cases2[$h]) && count($cases2[$h]) > 1)
 		{
 			$title2=$langs->trans("Ref").' '.$ids2.($title2?' - '.$title2:'');
 			$color2='222222';