diff --git a/lib.php b/lib.php
index 0e080ee..3e40142 100644
--- a/lib.php
+++ b/lib.php
@@ -321,32 +321,28 @@ class enrol_iserv_plugin extends enrol_plugin
 	private function get_courses_ldap($userid = "*")
 	{
 		// Used by a few conditionals below
-		$pattern = [];
+		$ldap_filters = [];
 
-		// Create course filter
+		// Create course filter by IServ group prefixes
 		if ($this->config->coursemapping_use_prefixes) {
 			$prefixes = explode(',', $this->config->coursemapping_prefixes);
 			foreach ($prefixes as $prefix) {
-				$pattern[] = "({$this->config->group_attribute}={$prefix})";
+				$ldap_filters[] = "({$this->config->group_attribute}={$prefix})";
 			}
-			$pattern = '(|' . implode($pattern) . ')';
-		} else if ($this->config->coursemapping_use_attribute) {
+		}
+		
+		if ($this->config->coursemapping_use_attribute) {
 			// If coursemapping attribute value contains a comma, treat it as list of valid attributes (OR'ed)
 			if (strstr($this->config->coursemapping_attribute_value, '|') !== false) {
 				foreach (explode('|', $this->config->coursemapping_attribute_value) as $prefix) {
-					$pattern[] = "({$this->config->coursemapping_attribute}={$prefix})";
+					$ldap_filters[] = "({$this->config->coursemapping_attribute}={$prefix})";
 				}
-				$pattern = '(|' . implode($pattern) . ')';
 			} else {
-				$pattern = "({$this->config->coursemapping_attribute}={$this->config->coursemapping_attribute_value})";
+				$ldap_filters[] = "({$this->config->coursemapping_attribute}={$this->config->coursemapping_attribute_value})";
 			}
-		} else {
-			self::debuglog(
-				"Invalid settings, enable either coursemapping_use_prefix or coursemapping_use_attribute",
-				"get_courses_ldap"
-			);
-			return false;
 		}
+		
+		$pattern = '(|' . implode($ldap_filters) . ')';
 
 		self::debuglog(
 			"Using filter {$pattern} to fetch courses for {$userid}",
diff --git a/version.php b/version.php
index 7cd2756..b864b5f 100644
--- a/version.php
+++ b/version.php
@@ -32,7 +32,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version = 2026021601;     // The current plugin version (Date: YYYYMMDDXX).
+$plugin->version = 2026021602;     // The current plugin version (Date: YYYYMMDDXX).
 $plugin->requires = 2015051100;     // Requires Moodle version 2.9
 $plugin->component = 'enrol_iserv';  // Full name of the plugin (used for diagnostics).
 $plugin->maturity = MATURITY_BETA;  // Beta, nees testing.