1 files changed, 2 insertions, 2 deletions
diff --git a/modules-available/statistics/inc/hardwarequerycolumn.inc.php b/modules-available/statistics/inc/hardwarequerycolumn.inc.php
index 5e16bcd9..0f8574f1 100644
--- a/modules-available/statistics/inc/hardwarequerycolumn.inc.php
+++ b/modules-available/statistics/inc/hardwarequerycolumn.inc.php
@@ -53,7 +53,7 @@ class HardwareQueryColumn
 		// INNER JOIN, so the result will be empty if the condition doesn't match.
 		$type = count($this->conditions) === 1 ? 'LEFT' : 'INNER';
 		$joins[] = "$type JOIN $table $tid ON (" . implode(' AND ', $this->conditions) . ")";
-		if (!in_array($this->alias, $groupConcat)) {
+		if (!empty($groupConcat) && !in_array($this->alias, $groupConcat)) {
 			$columns[] = "Group_Concat(DISTINCT $tid.`value` SEPARATOR ', ') AS `{$this->alias}`";
 		} else {
 			$columns[] = "$tid.`value` AS `{$this->alias}`";
@@ -85,4 +85,4 @@ class HardwareQueryColumn
 		}
 	}
 
-}
-\ No newline at end of file
+}