diff --git a/SeedDMS_Core/Core/inc.ClassDMS.php b/SeedDMS_Core/Core/inc.ClassDMS.php
index 01d0cd218..7d290f6a3 100644
--- a/SeedDMS_Core/Core/inc.ClassDMS.php
+++ b/SeedDMS_Core/Core/inc.ClassDMS.php
@@ -1454,6 +1454,10 @@ class SeedDMS_Core_DMS {
 				${$paramname} = isset($query[$paramname]) ? $query[$paramname] : '';
 			$query = isset($query['query']) ? $query['query'] : '';
 		}
+		/* Ensure $logicalmode has a valid value */
+		if($logicalmode != 'OR')
+			$logicalmode = 'AND';
+
 		// Split the search string into constituent keywords.
 		$tkeys=array();
 		if (strlen($query)>0) {