diff --git a/htdocs/comm/action/index.php b/htdocs/comm/action/index.php
index 6f24008c7ad3d..44f51e14b30f5 100644
--- a/htdocs/comm/action/index.php
+++ b/htdocs/comm/action/index.php
@@ -1965,9 +1965,14 @@ function show_day_events($db, $day, $month, $year, $monthshown, $style, &$eventa
 								$nextindextouse++; // Prepare to use next color
 							}
 						}
-						//print '|'.($color).'='.($idusertouse?$idusertouse:0).'='.$colorindex.'<br>';
-						// Define color  // @suppress-next-line PhanPluginPrintfIncompatibleArgumentType
-						$color = sprintf("%02x%02x%02x", $theme_datacolor[$colorindex][0], $theme_datacolor[$colorindex][1], $theme_datacolor[$colorindex][2]);
+						if (isset($theme_datacolor[$colorindex])) {
+							$color = sprintf("%02x%02x%02x", $theme_datacolor[$colorindex][0], $theme_datacolor[$colorindex][1], $theme_datacolor[$colorindex][2]);
+						} elseif (!empty(getDolGlobalString('THEME_ELDY_BACKBODY'))) {
+							require_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';
+							$color = colorArrayToHex(explode(',', getDolGlobalString('THEME_ELDY_BACKBODY')));
+						} else {
+							$color = "ffffff";
+						}
 					}
 					$cssclass = $cssclass.' eventday_'.$ymd;
 
@@ -2339,7 +2344,7 @@ function show_day_events($db, $day, $month, $year, $monthshown, $style, &$eventa
 function dol_color_minus($color, $minus, $minusunit = 16)
 {
 	$newcolor = $color;
-	if ($minusunit == 16) {
+	if ($minusunit == 16 && is_array($newcolor)) {
 		$newcolor[0] = dechex(max(min(hexdec($newcolor[0]) - $minus, 15), 0));
 		$newcolor[2] = dechex(max(min(hexdec($newcolor[2]) - $minus, 15), 0));
 		$newcolor[4] = dechex(max(min(hexdec($newcolor[4]) - $minus, 15), 0));